This is a tower defense battle in the galaxy and you’ve been appointed to this TD battle for survival. Choose upgrades, use your strategy to make it an indestructible tower and shoot the rush-aliens in this idle space tower defense battle. To defend against attacks is your final goal of this TD survival! What you can do: -Upgrade the strength of basic abilities -Activate and develop powerful weapons -Upgrade techs to unlock and improve abilities -Defense the space tower with strategy -Shoot and