Galaxian is a classic arcade game where you play as a defender at the bottom of the screen against an array of aliens above. Your goal is to move left and right to target an alien, shoot up the screen, and destroy it. The higher you climb the levels, the tougher the enemies become. You'll face off against different types of aliens, each worth more points when defeated. As you progress, a new enemy will appear at the bottom of the screen, escorted by a dangerous bomber that poses a significant threat.
The gameplay is fast-paced and action-packed as you try to clear wave after wave of enemies. Your movements are precise, as you need to aim carefully to hit the aliens and avoid taking damage from their attacks. With each level cleared, a new challenge emerges, keeping you on your toes and pushing you to improve your skills.