i don't normally play a lot of platformers (and am atrocious at them) but i found this really fun!! i like how when you go back in time you unlock more of the song as well :D
unfortunately haven't managed to make it out D: i liked how for the first few rewinds a rock falls nearby exposing a new path to a gem, but after the third gem i'm not sure where you're meant to go? the only path i figured out got me to the top of a rock where a blue object was peeking out (see below) but i can't seem to interact with it and i can't figure out another path :(
but i still enjoyed this game!! i'm sure someone better at platforming than me will find this a very fun game :DD