From Wikipedia: Hades Nebula is a 1987 Commodore 64, ZX Spectrum and Atari ST game by Nexus Information Systems. It is a vertical-scrolling space shooter. The player controls an upgradable fighter that must battle its way through thousands of enemy ships before it confronts the last boss, Emperor Hades. There are fifteen levels in this game.
Source: Wikipedia, "Hades Nebula," available under the CC-BY-SA License.
User Summary: The game was developed by Paranoid Software; Commodore 64 version was programmed by Mark Greenshields, graphics by Ned Langman, and with music by W.E.Music ltd. (Ben Daglish). The ZX Spectrum version was programmed by Mike Leaman, and with music by David Whittaker. The Atari ST version was programmed by Kyle Rose, Darren Melbourne and Darren Pegg, graphics by Ned "Paranoid" Langman, music by Ladislav John Brozovsky, and Sound FX by John Wylie.