Kaiju-ou Godzilla (1993)

An action game in which Godzilla must continue moving right, crushing opposing military forces until reaching bosses consisting of various monsters from the Godzilla universe. It was a Japan-only, Game Boy release.

Storyline

"Hundreds of monsters have arisen in the land of Japan and it is up to Godzilla to fend them off. The player must maneuver the nuclear giant through the stages and wage a cataclysmic war. Stamping out the pesky human machines that sought to block the player's path, Godzilla must fight the endless hordes of demons. Fighting one after another, almost in succession. Can the player master against the heavy weight of the monster world? Or will Godzilla loss his title as the King Of The Monsters???"