Hello there, thanks for your interest. The demo was offered for a limited time only and is no longer available.
Since this is a very complex and long project, we weren't able to make a demo that would be a good representation of the entire game and its plot anyway. We do offer a lot of screenshots and there are numerous opinions of people who already tried the game and described its feel in detail, so perhaps that could help you make up your mind.
Have a nice day!