Couldn't get music to play, but this appears to be a browser compatibility issue with Safari...**Edit: Had a friend test and send me video; the sound effects are really loud compared to the music. Keep that in mind for next time.
Other than that, there are visible seams around multiple graphics, and some environmental objects are easy to confuse with enemies, but I like the animations quite a bit.
The platforming definitely needs some tinkering and tightening up, mechanically, but it's a solid little game. Good work.