click with mouse on your fighter to start the battle.
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move the ship with your mouse cursor and hit the 
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left mousekey to fire deadly impulse shots towards 
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the rushing aliens. 
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but beware, dont let them hit you with their energy 
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drops. each time you've been hit by an alien your 
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shield will take damage.  
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the shield fails after 3 impacts and leaves the ship 
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vulnerable to any hit which means certain death. 
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the shield can be regenerated by collection power 
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ups......