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Defend planet Earth from invading ships.
In the immensity of the universe, alien ships approach the earth with no sign that they have come in peace.
An exciting battle begins against powerful enemy ships. Fast, accurate shots enter our orbit, and our only way to attack is defense.
They're all against us and we can only strengthen our shields to try to survive as long as possible.
Protect us from total devastation, as any carelessness will lead to extinction.