I really like the core idea - shame that even the “hard” difficulty is really short. Still, I had fun with the game, and it could definitely be expanded upon to make a fun arcade-style game (especially with that music - I’m impressed that you made that yourself, it’s pretty good and works well for this game).
Also I see you went for the diversifier world record. However, I’m not sure this falls under shapely - I think that’s more “everything is literally just a single shape” than “everything is simple enough to work with only one color”