Fortify is a Strategy, Indie, Action PC game, developed by Holgersson Entertainment, available on Steam and published by Holgersson Entertainment.
Fortify is a real-time strategy game with a tower defense twist. Defend your castle from attacking monsters and siege weapons by using ranged and melee defenders, catapults, cannons, oil fields and more. You start at the iron age, advancing to the medieval age, and later, the imperial age.