Brutal and Nightmare difficulties have also been bumped up accordingly.
Numantian Games also relaxes the timer for initial missions.
Numantian Games promises over 60 hours of gameplay in the zombie RTS' campaign.
Two new scenarios will also be added to Survival Mode - The Deep Forest and The Caustic Lands.
Numantian Games says campaign testing will take place internally and serve as a "new full game".
Construct a uniquely powerful structure for an added edge in battle.