This feels really fun to play, and the mechanic is neat. I like how when an enemy is on one HP, it's optimal to catch one shot, dodge the rest, and snipe them. Maybe add in some 1-health enemies to take advantage of that?
My only real complaint is restarting. Why do I have to move my hand over to the enter key? It's the sort of game that would really benefit from a really from being able to jump back in straight away.