Very nice game, there's a lot of attention to details in the gameplay and the levels are well-designed too. Already on the first actual level you have to do some actual thinking, even though it's still a small one compared to the later ones. The tutorial at the start is good and very thorough, you definitely learn the game in that. The graphics and sounds are simple and "small", but they work.
I'd like to invite this game to our Game Development World Championship!