Super cool idea for a game! I really liked the rewind mechanic how you basically make platforms for yourself. It was really cool.
One complaint I have is that it is REALLY easy to soft-lock your game and have to reset. I'm glad the reset function is in quick reach though and the levels are small enough that it is not very annoying to deal with.
Overall it's a fun and relaxing platformer game with a surprising amount of depth despite its simple mechanics!