What a great game!
The animations were super smooth and the music was great!
The death mechanic is really creative and add a lot to the game. I like how both the death mechanic and the energy mechanic encourage you to go head on into the combat.
I am probably nitpicking at this point, and I don't know if you did it because of the small hallways, but I think that bullets could probably be bigger. But other than that, game feel was trough the roof! Really, really nice job!