I really love the concept behind this game, and the minimalist graphics work well to show how the gravity works. I would have to agree with @FuturecopLGF that Level 6 is a bit of a difficulty spike for how early on it is in the game. I'd love to keep playing, though, once I get past that level :)
Also, the medals don't seem to be working for me? I don't know if this is a problem with the game or with my browser and Newgrounds not working together. I turned off ad block and everything. Help?
Edit: Medal showed up extremely late. Must be a problem with Newgrounds rather than the game.