A pretty simple mix of a first-person shooter and a tower defense game. You carry around turrets like in Portal and place them on the groundA pretty simple mix of a first-person shooter and a tower defense game. You carry around turrets like in Portal and place them on the ground to shoot at incoming waves of enemies. The diversity comes from random placement of walls on the level. Like with a smartphone game, it's good for playing in short bursts (like, 10 mins) when you have the time. For its tiny price, it's well worth a purchase.…Full Review »