It's not completely horrible, so let's start with the positive. This game has an interesting idea, and decent art direction. Unfortunately, that's not enough to carry the game at all.
The plot- It exists. That's all.
The Gameplay- It feels like this game was trying to be half-metriodvania, half digging game. Unfortunately, those are two great tastes which do not go well together. AtIt's not completely horrible, so let's start with the positive. This game has an interesting idea, and decent art direction. Unfortunately, that's not enough to carry the game at all.
The plot- It exists. That's all.
The Gameplay- It feels like this game was trying to be half-metriodvania, half digging game. Unfortunately, those are two great tastes which do not go well together. At least, not in the way that they have been done here. You end up with a half-baked platforming levels, and a digging game that would be at home in old, crappy flash games.
-Platforming levels- This is where your gear gets to shine. To their credit, some of the later mini-levels are kinda fun, and the controls are nice. Perhaps if the game focused on them, it might actually be fairly nice. Instead...
-The Dig- This is will take up most of your time. And it's some of the worst I've seen. Sure, you can find mini-platforming levels, but otherwise, you're just digging to get stuff, go back to surface, sell, dig, surface, sell... yeah. Oh, and most of your fun movement-based upgrades are almost worthless. Your dashing upgrade is great, except your primary goal is to go downward, not to the side, as invincible barriers prevent you from going too far to one direction.. Your super-jump upgrade would be nice, if you couldn't already wall jump to your hearts content. And you do eventually get a drill... that's practically the same as your pickaxe, except it's limited by fuel. It does make the grind a bit slower though.
-Combat- Is lacking, but it wasn't the games selling point, so I'll leave it alone.
-Upgrades- There are some nice, fun, metroidvania style upgrades. Three of them, to be precise. Almost everything else is boring stat ups, more or less. Almost everything you buy with money or the orbs in the town area is a simple stat-up. More Health, Better digging, longer lasting light, etc.
-Length- Oh, here's the rich part. Despite having a rather slow grind, and the fact I didn't try to speedrun the game... I finished it in 4 hours. Replaybility is... lacking, as it's the exact same crap you just literally did.
Final result- Just go buy something else. Like digging? There are more than plenty of games got you covered there.
Like platforming? Get a platforming game.
Like Metroidvanias? Get a metroidvania.
Personal recommendation- if you're looking for a game like this, but the shortcomings of this game bug you, pick up a copy of Terraria. Costs about the same, pretty good combat system, mining is still a bit of a grind but it's better than this. And length of gameplay and variety of upgrades beat this one out of the park.… Expand