Great theme, nice graphics and sounds, and fun gameplay! This is a game I really enjoyed. I would add some explanation for power ups, maybe before you start the game or when you grab a power up, and make the platforming a little more responsive (it's hard to get to the ground fast if you jump accidentally too soon or whatever). But besides that, awesome and very impressive game!
Also, if you rated my game, I'd appreciate it, haha. :)