Physics games are fun, and they usually rely more on coding than art, so you're really smart to go that route as an indie. So kudos on that.
What I would say, is try to give it a unique spin as far as style goes, and have some unique game play elements that compliment that.
For example, if your rolling object is a round, fat cat, maybe you have mice running around, and you have to synchronize the cat's mouth position during the roll so when it rolls past the mice, the mouth lines up with the mouse so the cat can gobble up the mouse.
That same mechanic might not make any sense if you used a different theme, but then there might be something else interesting you could come up with.
So, I'd have to ask: Can you tell us more about your theme?