01Waves of hundredsEach wave comes mostly from one side, and you're told which before it hits.
02The BehemothA boss that charges through your defences and mutates as the fight goes on.
03Night and fog of warYour torch and muzzle flash are the only light. You hear them before you see them.
04Hold the baseHire soldiers and engineers, buy turrets and guns, lock doors, repair windows, fall back room by room.
05Two-player co-opOne on keyboard and mouse, one on a controller, same screen.
06Level editorBuild your own base and play it. Open it from the title screen.