WASD movement
Mouse used to aim, fire weapon, and construct buildings.
Buildings do the following:
Turrets: cause damage to nearby zombies at a steady pace.
Laboratories: Consumes scrap to research Secret technology.
Factories: Consumes scrap to research weapons technology, unlocks weapons over time.
Hospital: Uses scrap to research medicine. increases your max life gradually.
Wall: stops zombies but does not damage them.
Fence: damages zombies but does not stop them.