It's a cool game. I suck tho. My main complains are: introduce some kind of a tutorial since I was totally blind and kept dying over and over, fix collissions: sometimes bullets don't hit enemies when they are in front of you (my guess is you're spawming it inside the enemy collider and it doesn't detect and overlap), and the annoying dead bodies animation that block bullets (you have to wait for them to disapear to have a clear shot) which is totally useless and just frustrating.
Enought bad things, I love the concept and although it's loosely matching the theme (since only the setting is underground) I would love to see it develop into something more. Im a big sucker for rougulikes and it's a pretty unique concept to have a turn based one. It's actually quite well polished but you definitely could squeeze out more juice from it. Either way it's a solid game