Central Alien Agency

You're a secret agent that's been ordered to eradicate the threat of aliens in America. Armed with a gun and some ammo, you have to make your way through each level while killing all the aliens you come across. Use your arrow keys or W, A, S, and D to move your character around. Push R to reload his weapon. To use your weapon, move your mouse around to aim it. Click your mouse to fire. Keep an eye on your character's health bar. If it empties completely, he dies! As you move through the game, upgrade his weapons to make better use of what you have.