Bane of my life - the problem is that it's kind of a quick-fix game - people want to play regularly but for a short time. This is bad for server populations - it's something we'll definitely be fixing in our next game, but for now I just need loads more people (hence the free keys!).
Email sent, sounds like a cool game but couldn't find the system requirements page (i fail at internet search), could you please provide said requirements?
Just a quick note - you must download the demo direct from http://www.mode7games.com for your free key to work.
Apparently there is an old version which some people are getting from Garage Games which is causing a problem - apologies if this has affected you - I'm trying to get it sorted out.