Geometry Hordes

Static 360 degree shooter, shoot'em up, shmup. The game becomes progressively difficult, so it's a matter of how long you can survive. There's a mini-nuke that becomes available every 10 or so enemies you destroy. You must place it outside of marked radius and shoot at it to blow it up, it will destroy all enemies in vicinity and if you destroy many of them you will get an extra bonus.

http://www.codergames.com/webgames/playflash/geometryhordes/
#shooter