Again with the "stolen idea bro!"
I have no idea whether you saw and polished the concept, but there was almost this exact idea somewhere here on newgrounds, except the paint was black and the screen white. Which, honestly I don't care about. the guy said "here's a concept I don't feel like finishing" and left it to rot.
But it affected me in the way that the novelty of it was gone. And once the "COOL! That's a neat idea!" effect ended, I was left with a semi-bland puzzle-ish platform game. There wasn't anything in the jumping/controls that interested me, and even though I'd sometimes think "wow, that was a cool level design/puzzle/powerup/etc!" there were too many other times I'd get tired of said level because the guy wouldn't jump when I told him to or there were too many frustratingly precise gaps to leap over.
Or maybe it was the music. It was extremely repetitive, just the same few measures over and over again. While at first nice and calming, it had...little to no content and would grate on the nerves quickly. It really needed to either be more ambient or have something, ANYTHING added to it to give it content. Even just ambient drums/synths would have done. The same 5 measures over and over again? Then ending it? The music sounds like it was added last minute.
Then again, I say all these negative things, but I only got to level 10 or so due to lost interest.
However, the paint's physics, the use of the color red for danger, and the power ups in general (Woo fireworks indeed =P) were really neat. I just feel that this game is missing something.
In which case, I suggest less frustrating platforming or making more complex jumping mechanics to give the platforming depth. (Perhaps wall jumping?)