Your mission in this shoot'em all with tower defense elements is to defend our planet from invading Aliens. If UFOs left less then zero your mission failed. You can buy new weapons and upgrade them for more power. Buy Lab to catch aliens for more cash. The game features 25 Levels, Main Gun with 10 upgrades, 5 Weapons with 10 upgrades, Alien Laboratory and Final Boss. Use YOUR MOUSE to control the game. Good luck!