Interesting, but a bit clunky.
It implies it’s dealing with pigment, but it uses a light-based color model. I mean, mixing all primary colors gives you white like light, not black like pigment. Sorry to nerd out about color theory, but that struck me right away!
Also, the tools to mix the colors are quite complicated to use, which drains a bit from the cozy vibe it seems to have at first. Anyway, I can see the potential for a pretty nice casual game.