Exerion

Exerion is a 1983 shoot 'em up video game developed by Kawa Denshi Giken and published by Jaleco for arcades. It was released in North America by Taito. The player controls a starship and must fire at enemies on the screen while avoiding projectiles. The game uses a pseudo-3D scrolling background, giving a sense of depth, and the player's ship has a sense of inertia while it is being controlled with the joystick. Exerion was ported to the MSX, Family Computer, and SG-1000. Two sequels were released.