The only reason I absolutely despise this game is because the gravity does not work. The ball will head towards a sun over a larger planet no matter what!
I really like the game, but only because of the white side. Black is too easy and boring, while white is fun and has replayability. The upgrade system is really neat and encourages you to try different colors.
I think the game is well made, a lot of the criticism is a little bit ridiculous. What else could be upgraded but rate of fire? If it were some sort of spread shot then you would end up hitting more colored pixels. Green does heal, so no worries about that. A top notch game. My only problem was that at the highest yellow levels, there were no more colors. A definite top-notch first game dapbot.