The goal of the game is to save the civilians but it soon turns into a zombie killing spree. There is going to be zombie blood everywhere before all the civilians are saved.

Your goal is to save the civilians by leading them to the safe spot while protecting them from the zombies.

Use your arrow keys to control Boxhead.
Fire your weapon with the spacebar.
Select your weapon with the number keys.

The radar screen in the lower left corner will help you locate the civilians who are blue and the zombies who are white. The red arrow points to the location of the safe spot.