Xtreme Polygon

Xtreme Polygon is a multiplayer game with some optical resemblance to Geometry Wars. The players are trapped within the boundaries of an arena and various floating geometry forms. These don't hurt by default, but if they become fast enough (e.g. when a player bumps into it) they become a deadly force. The players can also use guns (twin-stick shooter style; can be used to shoot small polygons) or bombs (float until they crash into something and explode). Sometimes power-ups float around which have certain effects when collected, e.g. upgrading the gun or spawning more polygons. Each time a player dies, a point gets detracted. The goal is to have the most points at the end of the match. While it is possible to play alone, there is no goal and only self-created danger.