Hey. Really enjoyed the game, but maybe you could add a "Undo" button, because often times I got confused when trying and exploring the possibilities. It's hard to remenber what color used to be where. The looping music was annoying after a while. Since you have daily challenges for replayability, new musics would also be great.
Also, on the end of the forty levels is a gray text congratulating me on winning a game about colors. Maybe I expected more.
Anyway, keep up the good work. It was fun and I'm coming back for the challenges.