Nice looking game..I esp. like the pumpkin headed guy in the top screen. I'm sure a nice coat of polish will make it even better, but this is one of the cooler looking 3DGS projects I've seen. As for color intensity, that's a matter of style and designer choice. Just because it's a toon style game doesn't mean the colors have to be vibrant. That's nonsense, and there's plenty of muted color toon examples out there.

Which toon shader did you use? If it isn't the Wiki one, is it available elsewhere?