GORF (Galactic Orbiting Robot Force) is a Fixed Shooter, same as Galaga, Galaxian, Space Invaders, etc. The difference is that Gorf has the best name because Gorf sounds hilarious. Which, for the record, Gorf is just Frog backwards- and Frog was a nickname given to programmer Jamie (then Jay) Fenton.
Also, Gorf was originally meant to be a game for Star Trek: The Motion Picture.

Gorf is pretty cool.

Gorf.