In the distant future, our civilization collided in space with various alien races. Some of them turned out to be quite aggressive and the first interstellar war began. You in the game Galaxy Defense will take part in it as a pilot of a space fighter. You have to patrol a certain zone of space on your ship. As soon as you get the enemy ships attack them. Firing from your side guns you will shoot down enemy ships. You will also be shot at you, and you will have to maneuver your ship out from under the impact.