Fun game~! I have never felt so stressed trying to replicate art, the time mechanic really gives the painting that "game" feel. With that in mind, I kind of wish because of that time mechanic, we had more painting tools at our disposal. At one point, when I was using the roller, I kind of wished I had something more extreme to get paint on my canvas (i.e., like a paint bucket splattering globs of paint everywhere).
Even with that small critique in mind, I really enjoyed your submission! Good stuff!