Like it a lot, the level design especially is great! Unfortunately, there seemed to be a bug, where the screen never scrolled down. On "Stepping stones" I was able to finish the last part blindly, almost thinking this was intentional, but on "Touch that thing to get a double jump" I ended up dying after the screen had partially scrolled up, before reaching the checkpoint, and playing blindly there ended up a bit too frustrating.
Music is also chosen well. Good work!