Our demo launches this Friday. This means that as of this Friday, at 12:00 MST, our "Download Demo" button will actually download the demo. As stated before, it (the demo) is free, and your saves are fully portable from the demo to the full version. I recommend using Steam Cloud save storage - for now, demo and full versions are in separate directories. If you can't use Steam Cloud saves, I will provide additional instructions are coping saves from the demo save directory. No one wants to do it manually, I know; but those with data restrictions or volatile internet connections need a solution too!
Our full release will be out at the end of the next week or two. Any delays will be pending on review statuses, but for now, I will be informing reviewers of a mid-September release.
If you know anyone you feel would be interested in doing a review or Let's Play of the full game, please let me know. I'd love to get word out there!