I like puzzle games and the idea is nice but not the fact that the timer resets the level. I'd prefer a star based success system (if you win the level in less than x seconds, 3 stars, less than y 2 stars else 1 star). It's frustrating to have to redo the whole level
Also I don't get it: are you supposed to be able to walk on the pieces or not? Sometimes I can, sometimes not. It's not a clear gameplay constraint so it feels unfair sometimes :)
Apart of that, it's a really nice game, that feels good and polished! Congratz!