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.
You can also choose to make allies among other players. That way you know you'll always have someone on your side! Allied players can harvest each others flowers and sentries don't target allied players. You can also help defend your allies forts against attack waves and other players.