Cold Fish Studios, er, "Cold Iron studios" says they're releasing a new map next month; Just give them another few $$$ and it's all yours.
I, for one, thought that I was purchasing a complete game, not something that is sold piecemeal. I find the "micro-transaction" model to be vomitous in nature; it is, in my opinion, similar to 'bait and switch.' "Oh, you thought you were getting the WHOLE story? Well, gimme another $10 and I'll give you another small part."
Chicanery all around with this game developer.