I like the gameplay and would love to see how puzzles could be expanded upon. It's a little difficult to see where the object you picked up will go, so it would be nice if we could see the object we picked up. Also for the buttons, it would be nice if they held onto the object, especially since in the last level, the sphere only touches the button for a small amount of time, or the sphere rolling off the button in the second level when thrown on.