Hey!! It's great to see another GameMaker Studio + BeepBox game creator (that piano sounds like beepbox, sorry if I'm wrong).
This game is really cool! I loved the way it's related to the jam's theme, traveling through time and changing the environtment is so clever. I appreciate the way mechanics change through the game, it feels more diverse and surprises you more every time.
Graphics and sounds could be polished and I think the game's rythm might feel a bit slow. Improving takes time and practice, but you're on the right way.
Good job!