Use the arrow keys to move and space bar to shoot. Press one, two, and three to switch between blasters. (Flame Thrower (3) must be bought) Press p to pause and have the store come up. There are different types of aliens: normal (green), strong (orange) (which go slower but have more health), and super strong (blue) (which move faster and have a lot of health). Press "b" to fire a bomb. Press "r" to fire a rocket. (You have to buy a rocket and bombs with your money.) Press the quit button (House)while you are in the store to stop the game.
If you notice anything that isn't working right, let me know. Also, check out my screen saver and animated name!