Really, really solid game.
The spritework and music is fab, and the character animations are simple and effective. Really satisfying to play, though I did run into a few issues here and there.
I tried to replicate this but couldn't, but I believe it happened from killing an enemy on the same frame their attack animation finished - the enemy would remain on-screen, still with an active hitbox and drained my health almost immediately. While it was only something that happened once, it was still something that occured.
I also think the enemy's speed could be lowered a little, or perhaps have their spawn rate lowered, as I was finding myself getting surrounded very frequently.
Aside from these little things, I had a lot of fun with this one. Well done!