It's free now. The core gameplay is fun. Item management is clunky. Enemy spawns are pretty bad, often times spawning right on top of you. The durability system isn't that good. The music gets repetitive pretty quickly. Worst of all, the game doesn't tell you anything on playing it so a lot of important features you just have to figure out. Such as the switches mechanic and the fact you need to use explosives to break the purple barriers.

On the other hand the general gameplay loop is simple but enjoyable. Shooting the demons are satisfying and the game doesn't overstay its welcome.