Farm Fortress is a persistent tower defense/farming/action/multiplayer game where you plant exotic plants and defend these against hungry mutated monsters, corporate robots and other players. Plants grow regardless if you're playing or not. You can design your fortress with walls, sentries and traps and help defend it yourself. Buy new equipment, attack other players or gather allies to help defend your fortress.
The timer in the upper right corner (lower left in design mode) is the attack wave timer and when it reaches zero, the mutant beasts have picked up the scent of your flowers and wants to eat them all, or the corporations have found out about your business and wants to end it by sending robots! Naturally, you must dispose of them.