Cool game! Nice clean presentation. Very smooth introduction of mechanics (for my tastes, probably too smooth, as I didn't really have that much to think about - my favourite was probably hard level 1), and the mechanics themselves are solid. For me the physics based nature often got in the way - for example it's a bit annoying to push the cubes around. I saw in your other comments you know hard 2 is broken (I cheesed it anyway ;) ). Thanks for the game!