Very cool concept and great execution! I like the fact that you're essentially shooting enemies with your own HP bar, and that it is made very obvious through the visuals. 

Small improvement ideas: 
The healing animation scared me every time since it looks as if I'm taking critical damage.
The amount of HP we have to shoot out seems too high. It would have been nice to make picking up the blood stains more of a challenge, since now it doesn't really matter if you pick them up on almost full health or not. 
The enemies are as smart as cucumbers. For me most of the gameplay was waiting for them to get stuck in the hallway. 

Still, great job in this limited time frame! 

cool buggy game, more content, i.e. sounds enemies items and so on would make this game really good

This game is awesome! The concept  fits perfectly with the theme and I think it was executed very well. I would like to see more juice. Overall very fun

Very interesting concept! If you just run with the core mechanic, develop more mechanics around it and polish the game, this could make a great rogue-like game. This project has a lot of potential, and I surely enjoyed playing it!