The first few introductory levels were really clear and concise. That was a really good wordless tutorial and I intuitively knew exactly what to do straight away. The concept is really unique. I don't think I've ever played a game about mixing together colours to make the right one before. But then taking that further and turning it into a puzzle is awesome. The art is nice. My only complaint is that sometimes it looks like I'm the right colour, but the shade is a tiny bit off, and I can't even tell by looking at it. I suppose there's no way around that, because if you actually made the shades more distinct then you'd be lying to the player.