Fun game!
Some checkpoints would've been nice though, especially in the later half of the game. Also, I would've liked if the music didn't restart even after you die, since it gets annoying to hear the same chunk of music over and over again.
Level 6 was kinda dreadful though, I wasn't too big a fan of the leaps of faith near the end. Maybe if the light around your character was a bit wider, I'd think it wouldn't be as annoying.
Hope you keep making stuff and try to take this and others' criticism into consideration when making your next project!