Galaxian

[Wikipedia: http://en.wikipedia.org/wiki/Galaxian]

Galaxian (ギャラクシアン?) is a 1979 fixed shooter arcade game by Namco and released by Midway Mfg. in the US. Galaxian expanded on the formula pioneered by Space Invaders. As in the earlier game, Galaxian featured a horde of attacking aliens that exchanged shots with the player. In contrast to Space Invaders, Galaxian added an element of drama by having the aliens periodically make kamikaze-like dives at the player's ship, the Galaxip. The game's plot consisted of a title screen that displayed the message "WE ARE THE GALAXIANS / MISSION: DESTROY ALIENS".