Optika is a puzzle game where you control light with 14 differents optic devices to complete levels.

"optimal conditions for a sacrifice" is a short (5k words) girls love visual novel. It features only a single linear route and one romanceable character, but there is an simple repeating puzzle you have to solve to get to the "true ending". It is LGBTQ+ dark comedy fairytale

In this sequel to Opus Castle, investigate the mystery behind the Joelma Building fire in a supernatural journey through time, uncovering the secrets of a demonic cult and spiritual horrors rooted in real historical events.

Opus Castle it's a 3D horror, adventure and mysterious game with a narrative based on the real tragic history of the little castle on Apa Street, located in the city of São Paulo, Brazil.

Opus Cortex is a nonogram puzzle game with captivating story and a cast of wonderful characters. You are an AI who wakes up in an unknown location, your memory chip damaged and unreadable. In the meantime, the world faces great dangers. Will you find out what happened?

Opus Ludum is a game of wit and skill, where you will have to overcome various challenges that will test your razor-sharp intellect at every step. Opus Ludum will give you a break from daily stress, although it might just break your head.

Opus Magnum is the latest open-ended puzzle game from Zachtronics, the creators of SpaceChem, Infinifactory, and SHENZHEN I/O. Design and build machines that assemble potions, poisons, and more using the alchemical engineer’s most advanced tool: the transmutation engine!

An independent story set before the events of Opus Magnum, De Re Metallica follows a maverick alchemical researcher named Saverio Daas, who believes he can unlock metallurgical secrets that even the Imperial Academy has not uncovered! Along the way he’ll clash with established orthodoxy, bicker with his assistant, and attract attention from the Great Houses. What happens when a new invention becomes worth much more than its weight in gold?

Play as the Death. Test your reflexes while trying to redirect souls to their respective destinations. Don't worry if it's a bit hard at the beginning, every work gets easier with time and experience!

"I will claim the starsongs, and bring honor to the clan." Exiled by his people, Jun ventures out in search of starsongs to redeem himself. But progress is slow, until he saves Eda, a witch who can pick up on the sound of asteroids. However, what appears to be a blessed encounter, will end up becoming a lifelong burden... Echo of Starsong is a narrative puzzle adventure game. Asteroids emitting a sound known as "Starsongs" have become the center of conflict for the immense power they hold. Determined to claim asteroids of his own, a young man ventures out with a girl who can imitate starsongs, lending her voice to unravel an ancient myth deep in the heart of space.

You are a weary, middle-aged photographer, retreating from a life of disappointment in the city to seek solace in your hometown. However, an unexpected turn of events leaves you stranded in an ethereal mountain realm, where you encounter a mysterious girl. To uncover the secrets of this mystical world and find your way back home, you must gather clues and unravel its secrets - with nothing but an old camera in hand. OPUS: Prism Peak is a narrative-driven adventure game where you play a weary photographer in his autumn years who finds himself caught outside of reality. Using your old camera, you’ll explore an ethereal realm and its ties to the world you left behind, uncover its mysteries, and ultimately find your way home.

OPUS: Rocket of Whispers is a post-apocalyptic adventure in which the two survivors vow to launch a rocket for a space burial to return the lost souls to the cosmos. Help them explore a barren world of mystery to fulfill their dreams.

OPUS: The Day We Found Earth is a chill, stargazing experience that's handcrafted for people who enjoy story-driven games and arguing about Pluto.

In this game there will be pitfalls of every kind! The 3D graphics allows you to see the light from above. This opens up a world of possible combinations. With gameplay based around light, OR is a simplified Puzzle/Arcade game.

ORACLE is a single player, open world experience with dozens of locations to explore, great soundtrack and an awesome story ready to be unraveled.

Oracle of Forgotten Testament is an episodic turn-based RPG Touhou fangame. Player will use Touhou characters to venture Gensokyo and resolve incidents.

An ancient prophecy, a chosen one? Shoot your way through an evil castle, collect powerful artifacts, and defeat the evil king. Explore this 2D hand-drawn world full of magic and monsters where nothing is as it seems.

Oracle Trials is action-packed 2D platformer with cute vector-art visuals combined with splendid particle effects and animations.

In Oracle: Threads of Fate, players can see the future of friends and foes. Plan out the perfect attack and lead your team to victory against overwhelming odds. But beware, your enemies are powerful and numerous. They will not be forgiving should you write your fate poorly.

Become the King of your own nation and restore the ancient empire of Oraiah. Claim the imperial throne by submitting your enemies by strength or by shining so much that it will force the other pretenders to the throne to submit to you. What will you do, my Lord?

Orake Classic is an old school, 2D tile-based ORPG featuring a variety of skills, monsters, bosses, quests, and extensive lands to explore. Your adventure begins in the Collapse, where the player must find their way out of the confines of their Nightmares. Upon escaping, the player ends up in the city of Aracia, a lively town where you can discover quests and mingle among the townsfolk and other players to learn more about how to navigate through the game. Just north is the Boneyard, where risky player-vs-player combat is possible. You can build up your choice of abilities among a variety of combat, non-combat, and crafting skills or roam and explore the many cities, dungeons, and special areas full of unique items and challenging monsters. Join a guild; or invite your friends and start a guild of your own!

Orakyubu is a game about 2D puzzles in 3D space. To compete each puzzle, you will need to push boxes onto every target. However, there's a catch - each puzzle is contained on the faces of cubes. It is possible, and usually necessary, to move the pieces of each puzzle across the faces of their cube as well as onto other cubes to solve the puzzle. Orakyubu contains around 25 puzzles. Each one requires you to approach it in a unique way, so no two puzzles are the same.

Orange is a spiritual successor to certain phallic fruit clicker Game, in which you click an Orange, only a little bit more annoying *wink*! All you have to do is click the Orange! No Drama No Stress

Have fun with this amazing tribute to the best SNES and MEGADRIVE games! Welcome to Orange Adventure! This game takes you on an incredible journey with Orange, the Box of Orange Juice, who must recover theOranges stolen by the evil Dr. Juicer's Robots and rescue his friends. Travel with Orange through multiple worlds -- from the green meadows of Orange Land to the desert wastelands of the pyramids, facing multiple enemies and game modes.

As humanity’s elite space trooper, you take on a heroic, action-packed adventure throughout the galaxy. Explore planets, protect colonies, and be the first to meet the unknown! Dive into the original story inspired by James S.A. Corey’s The Expanse series.

This is a game to develop the heroine of the cat world, relying on mouse clicks to play. The main function is to watch the story, choose the schedule, and participate in the game, and finally usher in different endings.

Step into Orange Lotus, manage your own elite escort agency, and build relationships in a city full of charm, secrets, and temptation. Beautiful characters, seductive stories, and high-class drama await.

Search for new life forms as you try to survive on a mysterious hostile world in the surreal 2D action-platformer Orange Moon.

Trapped in a prison hell, a desperate orange will play a deadly game in the hopes of getting shipped to safer markets. Can he survive what his captors have freshly squeezed for him?

Orange Santa is a 2D Christmas-Themed Platform Action game based on the story of Orange Santa who is in-charge of the distribution of the Christmas gifts among the children.

Orange Season is a farm-life simulator, with a high focus on exploration and different gameplay mechanics.

Orange and his brother Xiaobai, as well as their dolls and pet dogs, are involved in a strange incident. The group complains about defeating the heroes under the God of Homework and saving the world(?) in this spoof RPG. By the way, you will occasionally encounter some strange enemies, fight against celebrities who are inexplicably resurrected, bravely enter the regular ghost story school, encounter weird marketing accounts, be scared by the exposed muscle Fury and suffer eight levels of internal injuries, etc.

Orange You Glad I Didn’t Say Banana?! Play as Banana man, a bipedal banana with a minigun in this chaotic rogue-ike platformer! Mod your gun with a flamethrower, rocket launcher, or grappling hook, battle endless enemies, and climb the global leaderboard. The further you go, the harder it gets

Hey you! Do you like hardcore adventures where you take on the role of an even harder-core badass tasked with beating the crap out of a bunch of demons? Well, so do I, but sometimes it's fun to try out something a little different, you know? These four cute Asian girls couldn't care less about little photo stickers... They'd rather play with some 7.62x39mm rifles and filthy, filthy cash! Use simple controls to take down evil gang members and killer robots! Load up a shotgun so powerful you'd burn yourself to toast if the gas leaked and some brand-new fireproof sneakers, find a group of psychotic yakuza thugs, and personally deliver a handwritten invitation to BEATDOWN TOWN!

"Akane" is a yuri visual novel that tells the story of two childhood sweethearts from their acquaintance to their love and their subsequent life together. By playing this game, players can enjoy the sweet yuri love and the rich plot with multiple branches.

Oratorio is a rhythm action rail-shooter with an authentic 8-bit aesthetic that takes place in a dystopian cyberpunk future. As the enigmatic environmental hacker named Oratorio, players are the last hope for revival in a world run by evil mega corporations amidst a digital ruin.

Oraxum Trials is an incremental/idle game where you conduct experiments with the Oraxum, a hexagonal board with magical properties. Harvest souls and use mystical crystals to create wild concoctions. Take on the mantle of soul alchemist and forge your fate, choosing between light and dark forces.

This stellar story will require reflexion and dexterity! In the spirit of vintage marble board games with puzzles and mazes, use gears and gizmos to lead an orb trough constellations and rekindle all the stars!

A short experimental deck building roguelike! Use Attack Cards on enemy intentions to weaken their attacks, Use Heal Cards on status effects to increase their effects! Play as a Demon bounty hunter looking for their Target in purgatory as you combine and use Orbs.

Fly and collect all of the glowing orbs. Meditative Flight & exploration game with relaxing music.

Orb Flo is a puzzle game comprised of a set of prisms and receptacles. A puzzle is considered solved whenever the orbs flow through all receptacles. Flow can be altered by toggling a prism on or off.

In a world filled with darkness, orbs infused from darkness are spread around the world. You are an Orb Hunter and orb hunting you do. Join us in a Third-Person Dark Fantasy Action Game, and lets find gold and glory.

This is a simple puzzle game in which you click on orbs of the same color to make them disappear. The objective is to clear the missions given in each stage. Once you clear the specified number of stages, you will unlock episodes of fascinating heroines. Enjoy puzzles that test your brains and exciting encounters and interactions with numerous heroines!

In this room-scale VR game, infiltrate a mysterious company's secret underground lab protected by deadly laser systems. Throw orbs to move, hide, defend, attack and survive!

A bite sized dungeon manager game that requires new strategies every time you play! Mine, build, and fight your way to success.

Orb of Creation is an active incremental-puzzle game in which you recreate the world with nothing but magic and ingenuity. Conjure resources, buy upgrades, and become an all-powerful wizard!

A tribute to the old adventure games of the nineties. Orb Of The Watcher is party based RPG where you explore the tunnels under a large city to find a magical artifact. Encountering friends, enemies and the odd pile of gold along the way.

Go on a adventure through outer space in Orb Overload. Play, make and discover planets in this journey to get back to your ship while not dying from oxygen by connecting to Orbs!

A small yellow creature called Orb who has no ability to move stuck on a planet full of dangerous enemies and this planet is YOU. You are the only one who able to help him go through the multiple locations safely. Move the environment to roll him around the spikes, lava pits, and even lasers using various control mechanics from the basic platformer to a pinball like.

Snowy the snowcone is an alien who has been asleep for many years. When he wakes up, his people have VANISHED! He is the last of his kind, and he needs your help to find all 30 of the missing power orbs, so he can rebuild the mothership and bring his people back, before they face extinction.

A Roguelike Bubble Puzzler! Choose your school of magic and reach the top of the tower! Chill pick up and play feel and nostalgic pixel art and music. Get your staff and prepare to shoot orbastical spells !

Orbals is a fast-paced, rolling adventure puzzle game with wonderful graphics and sound. Quickly solve puzzles to master the Mojometer, find new Orbals characters and unlock special abilities. The player controls a spherical character called an Orbal through a series of traps in order to break all of the colored Mojo Crates in a level. There are over 100 levels included in the game and all stages are timed. Players can only smash Mojo Crates of the same color, requiring the player to roll over special color infusers to change the Orbal into the correct color. To succeed, players must quickly plan each move in advance to efficiently navigate and clear the stage.

Orbatron is an exciting game that will test your reflexes, focus, and spatial reasoning. Collect orbs, chain combos, and develop strategies to master each unique level.

Orbcraft Survivors is a time survival game with roguelite elements, where you craft orbs and enhance them with powerful perks. Merge identical orbs to strengthen them into more powerful forms. Apply perks to further enhance their effects. Experiment with different combinations to unleash devastating magic and survive relentless enemy waves. With over 50 perks of varying rarities, every battle offers new strategies and combinations. Discover powerful synergies, test your luck and tactics, and create a fresh experience in every run.

Incarnate the leader of a civilization, from the Roman empire to a Chinese dynasty, makes it prosper and stand the test of time. Orbi universo is a strategy/simulation game where you manage your civilization and make it evolve through different time period, from the Neolithic to the Middle ages.

Guide your very own civilization's destiny in this abstract strategy sim. Master a complex node system, overcome unique challenges, and evolve your society from humble beginnings to the mastery of the atom. Can your civilization *really* withstand the test of time?

Orbi is a space explorer. Together with his artificial intelligence companion A.I.S.A., they engage in ridiculous adventures. During one of his daily explorations, Orbi was found being chased by pirates. After a long chase Orbi was forced to land on an unknown planet. There with the help of A.I.S.A. he will try to find the parts he needs to fix his spaceship and leave. During his quest, however, Orbi will discover a terrible secret ... a secret that will change everything for what he knew. Orbi's Chronicles is an alternative RPG-looter where the battle system is based on word creation. odify your weapons with chips, make unique combinations and destroy your enemies. Progress as you level up and gain special skills which can be used on your created words. Disarm deadly traps or activate ancient alien shrines through mini games.

Orbis Fractura is the next evolution in classic arcade action. Smash through dynamic sci-fi arenas with explosive power-ups, relentless enemy formations, and a pulse-pounding electro-metal soundtrack. Designed for old-school arcade fans, it’s a bold 3D reimagining of Breakout-style gameplay.

Warning: ORBIT is a local multiplayer only game. No single player or online is available. Anyway it's a totally nuts game, grab some friends and try it on! Maneuver your ship between planets at breakneck speeds and take gravity into account as you crush your competitors with an epic spaceship arsenal. Use special abilities like shields and teleportation to defeat your enemies, and level up between fights as the madness intensifies in this twin-stick multiplayer space brawler! Duke it out in a big selection of game modes, and discover a tech-tree with countless options and different paths. Engage in fierce and swift-flowing combat, or design your own battles with the custom game mode, in which you can choose and set up the victory conditions, orbitals on your map and the length of the matches. Want more? Try the random map generator! Features: -Crazy local multiplayer for 2-4 players couch-powered madness -9 game modes: Capture, Kill, Survive, Mayhem and MORE! -Randomly generated maps for a fresh experience every game -Design and create your own modes and battles with Forge -Level-up system with spaceship upgrades and paths for total customization -Super hot particle infused graphics -Thrilling soundtrack by Wierzs -Bare-knuckled orbital amusement

Choose a geometric core, survive escalating waves with automatic weapons, and evolve matching weapons and passives into stronger builds. Explore sectors, find unlocks, and defeat the boss.

You are in the control of the Planetary Defense System of Earth. Your job is to protect Earth using turrets orbiting the planet. You have gotten full control of the planet and you are responsible to keep the planet intact.

Embark on a journey through the depths of space, and uncover an ancient legend. In Orbit, you play a small comet, hurtling between planets to a backdrop of procedurally generated nebulae and star clusters. A realistic gravity system is at the core, allowing players to have as much, or as little input as desired, watching while their comet flies into unpredictable new orbit patterns.

Orbit Maze is a unique maze game set on various surfaces. Control gravity, navigate through platforms, and solve mind-bending puzzles!

Let me guess, you're here to "join the Galactic Games and battle rival pilots for fame, fortune, and glory across the solar systems?" I've heard the dream a thousand times from rookies just like you. Well, you'll start at the bottom, same as the rest flying second-hand gear, scrapping for coins, and hoping your hatch doesn't pop off in a strong solar wind. As long as you're here, you might as well look around. Just don't poke your beak where it doesn't belong, this glamorous galaxy has more than its share of secrets... Orbit Outlaws is the definitive physics-based arena combat game. Use gravity to pull off impossible shots in competitive and casual multiplayer. Choose your gun, chassis, and pilot, then upgrade and optimize your loadout as you progress against rival pilots.

An astronomical puzzle game about discovering the rotational speeds and radii of epicycles.

Blast your way through the universe in epic battles full of insane destruction.

Create a Company, Build structures, Collect Resources, Make Investments and Speculate on Assets. Carefully manage your Workforce, Finances, Resources, Shareholders, BOD & Political Partnerships.

Your Uncle, Alon Munk, the famous rocket/satellite entrepreneur, has died and left you his fortune, and his new satellite internet company. Your goal is simple. Launch Rockets, Make money. Create the worlds first Global Satellite Internet Service... I guess you might call it a link in the stars? Or maybe some sort of Star Link? Not sure yet, obviously the name needs work. Your job as CEO will involve many challenges. Every satellite you launch enables more customers to choose your internet service, but bad latency will drive them away, so don't make your orbits too large... but also, don't put them so close that they crash into each other... its a real balancing act.

In space, no one can hear you scream – neither a victorious cry, nor one loaded with frustration. So what shall it be, Space Pioneer, when you are the Captain of it all? orbit.industries is a strategic space station building game where your job is to make the station as profitable and efficient as possible. You can play one of 3 modes: Campaign, Endless or Creative, the latter where you don’t have to worry about any constraints to your creativity. You can focus on making the station yield the biggest profit in the most efficient way possible, or do you want to focus on making it visually pleasing to the eye? The choice is all yours!

Orbit is a gravity simulator at the heart of a puzzle game. Launch planets with a flick of your hand, and try to get them into stable orbits around black holes. Can you make enough orbits to progress to the next level? Orbit features a Sandbox where you can create your own levels! Control time, disable collisions, and paint with gravity. Publish your creations to the world for everyone to play.

Protect your planet from alien invaders in this unique RTS experience. Freely reposition Satellites and manually dictate their targets. Manage your Energy reserves to send Satellites into orbit or unleash Planetary Powers.

Did you like Missile Command? Did you goggle over Galaga? Well you'll love this gorgeous action space game. You play an orbiting space station charged to protect your host planets from unfriendly skies. Full 3D realistic looking planets as well as simple, familiar gameplay will make this game an instant online classic.

Prepare for an exhilarating experience with ORBITAL, a simple yet addictive space arcade game where you take control of a lone satellite orbiting a planet! Your mission is to defend your solar system and destroy waves of incoming enemies in this fast-paced, action-packed challenge. Rack up points by skillfully eliminating threats and strive to set new high scores! ORBITAL offers gameplay that's easy to pick up but difficult to master, ensuring hours of engaging entertainment. Experience the thrill of classic arcade gameplay with a modern twist.

Orbital Approach is a Physics based, arcade space game where the highest score rules supreme. Navigate around planets, avoid obstacles, travel through wormholes, and more!