Gradius

Gradius is a horizontally scrolling shoot 'em up arcade game developed and published by Konami, originally released in 1985 (and known as Nemesis in some Western markets). The player pilots the Vic Viper starfighter, building up a customisable weapons loadout via the series' distinctive "power meter" upgrade system. One of the most influential shoot 'em ups ever made, it spawned a long-running franchise across arcade, console and home-computer platforms (Wikipedia)