Galaxian is a semi-3D update of Namco's arcade classic SD Gundam: Over Galaxian , featuring the famous SD Gundam characters. The game follows the story of the SD Gundam characters as they try to stop an alien invasion.
The gameplay in Galaxian is similar to the original, with some added features such as power-ups that can be used to help players progress through the game. Players control a spaceship and must shoot down waves of alien enemies while avoiding obstacles and collecting power-ups.