For all its competence, there's no real hook for anyone who doesn't remember the original Rocket Knight game. It appeals mainly to nostalgia for the way platformers used to be. Although it has a lovely next-gen presentation with the hi-res, 3D graphics engine, this is very much two-or-three-gens-ago gameplay. Not that there's anything wrong with that. But when you cost $15 and you're competing with, say, Soosiz on the iPhone, Trine on the PC and PSN, and Shadow Complex on the 360, you need more than a long-forgotten possum and his rocket pack.