N+'s presentation suggests a much simpler game - at least if you're the type that believes that the number of polygons a game can push is an indicator of its challenge level. Backgrounds and platforms are a simple, flat grey while most of the obstacles are basic, single-colored shapes. The real visual star is your ninja. Although he looks like a simple, shadowy figure who knows how to accessorize, some of his animations are really great and, when combined with the physics system, showcase an amazing range of movement.
Music has a smooth, jazzy electronic feel that is as simple as the game's visuals. Although the soundtrack does a good job at constantly pushing you forward and keeping you in the game, it also stays out of the way. You'll always hear it in the background, but it doesn't fight for your attention, nor does it become bothersome.