Arrow keys to move. On mobile, tap on either side of the player to move. Tap above the player to jump. You can fly by jumping while still in the air. All levels are possible (except for the endscreen. that will be true.). There are 12 levels, including the endscreen. I don’t count the home screen because that’s a backdrop, not a costume in the level sprite.
Tap the play button. My best run for now: 46 seconds
