Name: Power Wing (USA) / Slap Fight (EU/JP).
Music by Yuzo Koshiro (The Galway of the Genesis! Also made music for Streets of Rage (jp: Bare Knuckle) 1-3 and Super Shinobi)
c64 info (From Lemon)
Copyright: C64: Imagine, 1987
Orig: Taito, 1986
Programmer: John Meegan
Graphics: Stephen Wahid
Musican: Martin Galway
Alcon were released in US by Taito and Slapfight were released in Europe by Imagine.
Alcon c64 manual background story (from SHOOT!):
IN A FUTURE WORLD ON THE BRINK OF DESTRUCTION, ONLY YOU HAVE THE POWER TO SAVE THE PLANET...
Welcome to the year 2059. The planet Orac is under an alien occupation of terror. The Alien League Of Cosmic Nations (ALCON) has chosen you to pilot the top secret experimental SW475 Starfighter. You´re the last hope there is to stop the enemy takeover. To reclaim the planet you must destroy the aliens once for all. There won´t be a second chance. Now you can blast into one of the hottest arcade games right in your own home. It´s the ultimate inter-planetary combat. You´ve never seen action like this.
Copyright: Imagine 1987
Story: As the pilot of the Slapfighter, you must destroy the evil alienswarms which confront you on the planet Orac.
Game: Much like any other vertically-scrolling shoot-em-up; fly around the monochrome landscape shooting the hostile aliens and ground-based guns. If an alien wave is completely wiped out, a star-shaped power-up is dropped. This will highlight one of the powers on the left of the screen. Press SPACE to select it, or alternatively wait and collect more power-ups to advance to the next power.
Review scores: 9/10 in Your Sinclair Sep 1987, 72% in CRASH #43, August 1987. "Above average shoot-em-up".