This is the type of puzzle game I get hooked up on once, but will never try again. That's not a bad thing because that happens to 99/100 puzzlegames. Nevertheless I think it's pretty clever and designing the physics for this would probably be a total butt. It does not really feel challenging as some levels are just trial and error and less problem solving. Some variety in type of levels or more hazards would make a nice addition. This is also a game that would be lovely with a level design, though not required.