I think the use of the limitation here is a little off (although mine is too, haha) other than that the gameplay was relaxing and fun. I found it interesting to combine the colours and try to get the desired one, I got a few coins. Is there anything to do with the coins besides sell your colours?
Also, I'm not colourblind myself, but I think somebody who is would find this game very difficult. Not sure how you can fix that, but it's something to note.