This very good. I can see there was a lot of hard work put into it. Its a little saddening that we don't get the full story without paying, but three years worth of work is worth paying for. (and its only really an annoyance for those that 'can't' pay for it. like myself.)
Also, I get that the full walkthrough would only be for paying people, but do you think you could release a 'demo' walkthrough too? Having played your previous exmortis games, I was never able to do the whole game without looking at its walkthrough at least once, and this game is the same. Even for just this demo bit, its stumped me.
Overall though, awesome game, awesome graphics, awesome... well, everything. Definitly worth paying for, if i could.