the idea was really intresting, but there are a few problems i have 

 the character dosen't flip when aiming backwards (looks way better and dosen't look weird when aiming backwards)

you can't die and shooting blood costs way too much

also idk if this is the intentional end but after killing the big bat i got stuck and idk if it's the ending or a genuine issue

also no real juice but it's a jam game so it's not really that much

Good game, I find interesting the mechanics that ammunition was an element that is obtained by killing enemies, although that you can get it by suffering damage seems out of place, anyway, good job.