Here is my game.

Note:

I didn't have time to finish everything but, at the end (when you die) the game just closes.
 The game is Untitled because the rules never said that it needed to be titled.

 Story:
 The year is 4535. The earth has undergone encounter with aliens and has trapped them on a planet.
 The aliens have found a way to escape.
 Shoot down as many of them as possible.
 DO NOT LET THEM ESCAPE.
 
 Controls:
 Click to shoot
 
 Move with:
 WASD
 
 Download:
 http://www.mediafire.com/?l9sq23do1bb4ipf

Cheers.