While I would suggest adding more mechanics, the fact this is so minimal is really cool and also I'm not sure if more mechanics would be possible or simple.
Thanks for playing!
Yeah, I've thought about new mechanics too, perhaps something that splits a colour into two smaller lines or something that blends the colours together (blue and yellow into green).
I really like MOSI, though it got pretty complicated to code this much towards the end. I might try learning a more complex game engine and recreate it in there instead though.