It is a very interesting concept. I like the idea of a relaxing painting experience and the graphics and sound are mixing quite nicely with the concept.
But I didn't quite enjoyed the gameplay... The memorization part didn't resonate with me and having to wait 10-15 seconds just to change the colors after I was finished painting was really tiresome.
I had to put it down after a few colors... Because It's not relaxing for me to have to wait so much.
But If I had kept going, probably would just "cheat" by taking a screen shot of the colors instead of memorizing them.
I don't think the Limitation was improving the experience, it felt to me like it was getting in the way of the intention of the game.