Pretty neat. The art is very nice, and the gameplay relaxing. I found sometimes though I'd just lose because the colour gem I needed didn't (or barely) came onscreen. Also some indicator of what the next colour gem is would've been nice too, as sometimes I'd click one right after it would change and get penalized.
Little note: the limitation is "You are your own enemy" and "Colours" is the theme. I would feel bad not mentioning the mixup.