Theres apparently a secret level 12 after 11 I can't play ):
Anyway, decently fun and easy puzzle game, but the timer doesn't really play any role at all due to them being very short.
I just didn't put a security so after level 11 it try to make you play the next one lol. Also If you like making the game harder try the speed run mode that keeps the same 60 seconds for all the leves together
