Do not disappoint earth - as their last line of defence!
Intergalactic Defence instructions:
Defend the Space station by buying cannons to destroy the advancing alien ships. The ships and cannons all vary in speed, range and power. Your objective is to survive 14 levels. Enemies will pass through space to attack the Space Station. You lose the game if the Space Station is destroyed. You need to buy cannons to shoot the enemies to stop them from attacking the Space Station. When you destroy an enemy, you will get extra money to buy more cannons. When the game progresses, there will be mo
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