Centroid

Defend your planet from incoming space debris. Blast asteroids, avoid collisions, use power-ups - and get a high score! This game plays like a twin-stick-shooter with a twist. All movement is "orbital." Your ship moves in an orbit around your planet, as do the enemies. It's a pretty neat spin on the classic space-shooter genre. "Planet Centroid - Mankind's last chance in a dying universe. The cosmos themselves are raining down. Defend it with everything you've got."