It was fun to play, short but fun!
The only thing I didn't like though, which is personal preference:
The jumping seemed slightly unresponsive to me, since to me it looked like I was standing on the ground, yet it wouldn't allow me to jump until a very little while later. The hitboxes might also need to be fixed, since sometimes you get hit even though you barely miss the enemy, or you don't get hit when you should get hit.
Overall the game was really fun!