Finally got all the medals! :D It seemed impossible at first, but it does get easier as you go, though it took a looong time to start getting into it. Really helped with the update regarding the lives too, in that you can keep grinding without starting over entirely, though I also wish checkpoints would re-activate when you pass them again, so you don't need to go across the map for certain sequences (though I understand that's the challenge of it too).
I found a weird bug where as in small square form I jumped into the blue stairs, but could jump out again. Seems to happen every once in a while. It's also possible to get stuck between the green checkpoint and the wall if you haven't learned to switch size yet.
One other grievance: managed to get at least two of the sequences that don't reward medals by accident, thinking wrong regarding the order, but it bugs me a bit how even though you get a 'Submit Score' screen you can't submit the score for those particular sequences. Especially since I managed the hardest one with zero death and super short time on one particular good stroke of luck gaming. XD
Overall this was more fun than I thought. I like the idea, and the simplicity, though the controls feel a bit wonky sometimes, with regard to jumps and landings and such. Takes a while to get into. But once you do: good game!
-cd-