Truxton
Truxton is a 1988 vertical scrolling shoot 'em up arcade game by Toaplan that was later ported to the Mega Drive (worldwide) and the PC Engine (Japan only). Like many other scrolling shooters, the game is set in space, where the player takes control of a small spaceship on several planets. The game is played with an eight-way joystick and two buttons (a shoot button and a bomb button) through five large levels and their bosses (which then repeat forever at higher difficulty levels).
Story
Somewhere in space: an armada of Gidans, led by the evil Dogurava, invades the planet Borogo with five giant asteroids. After surviving an attack on a barge orbiting Borogo, a pilot boards one of the remaining space fighters and challenges the Gidans in a desperate attempt to repel the alien invasion while deflecting their asteroid fortresses.