The new generation wants to destroy the homeworld. Help them defend themselves! Move the mouse around to aim the base at incoming spaceships. You don't even have to click to fire, it fires automatically. The bar on the top right is your health. Each time you get hit, it decreases. If you pass a level, you will get to spend money on upgrades and weapons. If you have acquired special weapons, press the 1-4 keys to use them. Power-ups will also fly across the screen while the spaceships are attacking. If you can hit the power-up, you get to use it!