Galaga

Galaga is a fixed shooter arcade game that was released by Namco in 1981. The US version was released the same year under license to Midway.

The player controls a spaceship (which can move only right or left) and shoots at swarms of incoming insect-like aliens that fly in formation above him and occasionally swoop down to bomb him in a kamikaze-like dive. The enemies in the top row will sometimes dive with one or two escorts. Enemies that survive a dive will rejoin the formation from the top. When all enemies are destroyed, the player moves on to the next level. The game is over when the player's last ship is destroyed or captured.