Hi,
I'm Pontus (@knurf), developer of a game called Farm Fortress. I code this part time, together with a few friends, mainly Dave (@fuzfighter)
The game is played in a persistent world with many real time elements, meaning it keeps running even if you are not online.
Other players in ranking range can attack your fortress. If you are online at the time, you deal with the threat in full multiplayer. If not, your cannons and other automated defenses will keep it as safe as possible. It's something of a tower defense in this sense. After each attack, the camp has a cool down time where it cannot be attacked again.
You can also team up with allies and help protect each other, and we aim to implement an elaborate guild-like system real soon.
Plants grow regardless if you're playing or not. The very forest you've cleared away keeps growing back, providing much needed cover for an attacker. Everything is persistent and can be destroyed! (well, except your tent, it's crazy stable)
It has a slightly different business model, you get all content for free and play as much as you like, but you are limited by your skills. If you use up all of your lives, you are forced to wait for 12 hours to get three new ones. This makes dying in the game more dangerous and "real", adding actual value to each life you have. Of course we also sell lives, so you don't have to wait (that being the business part of it). If you're any good, you can stretch those free lives for days.
We're currently in open alpha, so please help us out and give it a try here:
http://farmfortress.comOn a nerdier note, although the game is played through Flash right now, it is actually written in another language for a custom virtual platform developed by me. It's a really controversial design decision that makes coding games something like it was back in the day, on Amiga/Atari. You write everything in assembly language and there is no operating system or drivers to interface with, only hardware registers and memory. Flash is merely an emulator in this case. Read more about this oddity here:
http://farmfortress.com/about-us