Dark not as in "serious/gory/edgy/brutal" but literally dark. But with alot of color splashes everywhere.
As opposed to dark and muddy without colors or bright and colorful where you almost don't have dark colors at all.
I dunno, the only game that does this to me is Torchlight 1. It's almost perfect, but as awlays I want some more. TL2 somehow turned out to be gray and muddy and the oppisete of what I liked about the first one.
Genre is not really important, but I'd rather not have some racing or point and clicks, though those are fine too if they are really fucking good.