I think I might buy this game purely for the visual richness, to encourage this sort of thing being continued. Hopefully it plays well, too, but I can already see myself getting killed because I'm gazing dumbfounded at the gorgeous backdrops.
Seriously, they have a real depth and beauty and give a remarkable sense of space, like you're actually moving through a landscape, like you could actually venture into those backdrops. It gives a sense of inhabiting a vast world. And that's just from screens and a trailer. Can't wait to try this out; besides, it's been too long since I played a real good side-scrolling action game.