What a great game. The ability to change the gravity was really cool. I think you'll have a great game when you fix all the minor bugs and finish with more levels.
Just saying, as it's not too bad of a first creation, but you really should try to make your games differ more from the tutorial levels of StencylWorks.
 "Sarah's Run (preview)"){kind=icon}
 "Cubelands"){kind=icon}
 "The Maze Game!"){kind=icon}
 "Ninja Ball to the Wall"){kind=icon}