Citywars Tower Defense is a mix between a survival game and a tower defense. Craft your tools, gather resources to build your towers, fight incoming monsters, level up your weapons each with unique skill trees, enchant your armor and play with your friends coop or split screen and more!
I love the concept, and with friends I'm sure it would be a ton of fun, but singleplayer ain't half bad either!
Good mechanics, never had any handling issues, lag, etc. It's neat to see other players walking around selecting missions with you, even fairly far into it. The basis is definitely there for having a personal zone of some sort that you build...