Cool game, with a good fit for the theme! The balancing act of either regenerating health or doing more damage was a nice feature.
I accidentally died just because I wanted to see what happened when the no-meter filled, but the boss checkpoint saved me (that checkpoint was a good idea!). I guess it could more fair if your health started to bleed once you reached that level?
The shooting is satisfying, and the game feels polished.
Nice work!!