The atmosphere was awesome. Screenshots alone made me want to play the game. The main mechanic is also a really good use of the limitation. The revolver mechanic reminds me of Endoparasitic. There's not much I can complain about. If I had to nitpick, the death screen is a bit too abrupt.
Just out of curiosity - because you only listed Unity as the software you used - did you make the art and music yourself?