Joris thank you for that info. As you are the expert on this game, Russ had a question yesterday about saving the game. I don't think this is possible but maybe you know different. So the questions are:

1. Can you save your progress?
2. Do you have to start at the beginning every time or does the game have levels and after completing a level you start at the next each time?

1. yes and no, you can't save but ithas an autosave feature, just like the CoD series it saves your XP, rank and achievements you've earned after every mission.
2. no, you can start every mission you want (you can start with the last one if you like ) whenever you want.
so far there's only 1 campaign, but i've downloaded some mods and found some that are of interest to me.
Lost cause is a survival map, the aliens come in from 2 hallways and grow in numbers as the time passes, the mission is to survive 10 minutes. this is pretty hard on normal, and nearly impossible on insane, looking for some guys who are crazy enough to try this with me only using chainsaws
visit http://swarmarmory.com/maps for a list of downloadable maps and mods

Nice one Joris mate, the survival map sounds nice, and chainsaws are funny to use on ShieldBugs, , that is towards all aliens! Lol