Pretty cool art style! The music is cool too. The bosses are pretty cool visually, but I think the gameplay would need some balancing, the fights are pretty quick and just a matter of smashing the attack button. Good work!
PS: I had some performance issues in the ballerina boss, maybe it was because of the web version, I've face something like that in my game too :/
Also, it feels a bit weird that there are no collision boxes in the main hub before starting the game (the barrels, crates, benches, and so on)