The game worked well for me. I like all the art, and the level feels very complete with the boss and everything, so nice work!
For improvements: maybe I'm just used to playing games with dodging but I feel like there should be a dodge roll or something?
Also some slight sound pitch variation with the sound effects would be good - with the same sound playing over and over again it can get tiring to the ears. - but not a big deal for a game jam.