Nice game! The graphics definitely compliment the idea of the game well! However, the game itself is a bit clunky to play. I don't like how you move the same speed as the enemies, since it just makes you feel super slow & heavy.
I was confused on how the healthbar worked when I was playing. I assume that when you shoot or get hit it drains, & you have to keep it from depleting? Maybe some explanation in the description would be nice.
Also, the game feels pretty dry to play. Adding in some screenshake, frame freeze, & juicy SFX would make it much more fun to just kill enemies. Overall though, good job!