Short version – worth playing, even if it is a bit short. Available on PSN, XBL Arcade, and Steam (probably most worth buying on Steam, honestly, but if you’re an achievement-monger go ahead and get it for XBox, but only 360).
Contrast not only has cool mechanics – you can be a person or a shadow! – but is a rare example of a game that features not one, but two! female protagonists who aren’t damseled in any way, shape, or form. In fact, they’re the absolute antithesis of damsels, which is pretty rare, and pretty darn cool.