You are stuck in the beta sector, and aliens are swarming you at every turn! A counter in the upper left corner counts down how long you have until the next wave of aliens comes. The upper right corner tells you how many shots you have left and how many ammo refills you have. You regain a little bit of life after each wave, but try to shoot the aliens before they can cause too much damage to you. Use the W, A, S, and D keys to move your character around the level and avoid getting eaten by aliens. As you go, you can pick up new weapons and upgrades.