A cool little game. Lovely art and animations, would be nice to adda squish animation on landing, but otherwise nice work.
The controls feel good, and great job implementing the TREAT option of adding a checkpoint system. I think its good that you have checkpoints before each new challenge, and that once you hit a switch, you don't need to worry about making it back safely, as the checkpoint acts as a teleport back to before that section, but the switch remains active.
Very good start!