I like this idea a lot. There's a lot of potential here, to the point where I could imagine it getting overwhelming, depending on how ambitious you would want to get. I'm glad I looked in the comments for the lighter puzzle. It was a really clever idea that just needed a smidge of a hint, I think.
One thing I would suggest is removing the platforming entirely. I felt like it got in the way of the cool painting stuff. I know you probably did it to make the game a little longer, but the painting stuff is a strong enough concept on its own that, even if its short, should be the main focus.
Very well done!