It's not a bad game, don't get me wrong, but it's just not fun. The gameplay is slow and boring, and the puzzles are repetitive. When I saw level 20 I couldn't help but think: seriously?
For everyone to know, if you try to save your creation it says that the shared content API isn't available for unity games yet. That's why it isn't implemented.
I've just noticed that when you play again, you start at the position of the ranking you got on your previous game. For example, if you did better than 20 players, the next time you start a new game you'll be in front of those 20 players.