Nice game! Impressive work especially with the animations which made the game feel very responsive. I haven't beaten the boss as i'm writing (but i will try angain), i can appreciate an hard bossfigt but i think he has way too many HP.
That's the only criticism that comes to mind really, again good job!
Edit: Only now I saw that the characters and the animations are from an asset library, which is fine but i guess the complement didn't age very well.