N is an award winning 2D action/puzzle platformer reminiscent of lobe runner.
So, you are a tiny stick figure running about in a puzzle world inhabited by enemies. Everything in the game is starkly minimalist, but the 2D physics means everything is incredibly smooth and fluid, with the man character in particular being animated beautifully.
Very cool. Includes a built in level editor NED so you can make your own levels to share in the community.
Free for Windows.