Love the clean, minimalistic visuals. Finished all the levels with full score, I get, that you have to paint at least until the number of the color is full, but should try not to paint much more, because that would cause deductions from your three score points. But it doesn't feel like this will carry a game, it would need another mechanic to make it less trivial: points where you have to refresh the paint so it doesn't run out, or maybe parts of the level that drop/get destroyed, when you leave them, so you can only pass there once. Good job on the overall presentation.