Galaga

Galaga is a stationary shooting game in which the player controls a fighter and tries to stop Galaga's army from killing all of mankind. Each level's objective is to fight all of the Galaga aliens coming towards you and accumulate as many points as possible along the way. 

Your spaceship will be located at the bottom of the primary play screen. From the very top of the screen, a series of alien names will start to surface in batches. You can shoot them by moving your machine left or right. Later in the game, some enemies may separate themselves from the group approaching you and smash into you.

Released

Namco was responsible for the development and publication of Galaga in Japan, while Midway was the game's publisher in North America in 1981. The game is a sequel to the 1979 film Galaxian.