Grab your gun, slap on some modules, and get out there to destroy hordes of alien invaders on a procedurally generated and fully destructible map!
Hordes of alien invaders have invaded Earth, destroying everything in their path. The enemy has broken through the surface and is rapidly advancing into the depths - mines, subways, old bunkers, bases, and tunnels. The underground has become a battlefield: dark, cramped, and dangerous.
The military is conducting a series of sweeps - step by step, meter by meter. You are part of this machine. One of the soldiers sent below. The order is simple: clear the sector.