Fun! I really enjoyed the chiptune music. Tutorialization was pretty good, though it did take me a bit to figure out I could double-jump on lvl 1 (tried walljumping to get to the gem for a minute or two, wasn't getting me any closer lol.) The difficulty really ramped up on lvl 2 with some very clever platforming challenges!
Finished my playthrough in about 10min. Nicely done! Quite a bit of gameplay/challenge packed in there, and the illustration at the end was a nice reward.
Bug: "Main Menu" button in credits submenu does not seem to be working