If you follow this guide it will easily get you 1k each play every time! So read up and get out there and play as much as you want; who knows you might even get a trophy!
The point of this game is to help Cylara and Gorix survive the dread planet of Kreludor. Help them gather up their ship parts without them getting killed by the evil inhabitants of Kreludor. It is either kill or be killed so kill all enemies in your way. They must complete all the levels in order for you to truly win the game, but it is still fun to just play and see how far you can go. If you beat all 20 levels then you win the game, and they are free.