Fun, but it has problems. The framerate is poor for a 2D game and interferes with gameplay. The color scheme is entirely browns, reds, and neons, which lacks contrast and makes it difficult to see. Structures and special abilities are optional until very late in the game when they are suddenly necessary and unobtainable - but that's only a problem if you want the badge and don't feel like being forced to replay twenty-odd waves. Good game - 3/5.
The gameplay is unintuitive, even if the ball/planet interactions are analogous to some Newtonian rules. Since the rest of the setup is entirely non-realistic there is no reason why there cannot be flexibility in the setup, size, and friction of the planets. As the rounds get more difficult, they abruptly stop being fun. At the moment difficulty is not balanced with achievement - it is just the product of inscrutable rules. Also, the badges do not load correctly.
 "Momentum Missile Mayhem 2"){kind=icon}
 "Gravitee"){kind=icon}