This game is really cool! The camera shake, particle effects when shooting etc are just perfect.
Just a few feedbacks:- The music only plays when pause. I think that's kinda abnormal.
- Would be better if there's no slow motion when 1 remains. It is annoying.
- What does the heart have to do with anything. I jumped out of the arena and the player keeps falling instead of any key to restart or deduce heart.
Anyway keep up the effort :D