A bug related to demo save files caused errors in the games of people who played the demo, we tried to fix it without making you lose old progress but we haven't found a way to do it that doesn't cause even bigger problems. Last update fixes the issue but doesnt preserve demo data, sorry to all of you and we hope you can enjoy the game even if starting from scratch.
Problems with demo save files
Build and release context
Recorded Steam release date:
Within one calendar day of this post (UTC). The listed date does not establish an exact launch time.