Great platformer game, the double jump animations and ability to shed feathers were quite funny! I lost it at the start upon hearing the slide whistle sound because I just bought one a few weeks ago! That being said, I couldn't seem to advance to the next level past the tutorial about shedding feathers, so there's not much else I could critique. Good work!
EDIT: I figured out why I can't seem to progress past the shedding feathers tutorial. I wasn't on fullscreen on the browser, which cut off the sides and hid both of the other buttons that needed to be pressed (and also the exit door lol)