Quick update: Version 1.0.2 introduced a save file bug. This version has been reverted back to 1.0.1. If you relaunch Steam and update the game, save files should work correctly again.
Fixed bug on version 1.0.2
Build and release context
Steam update times within 24 hours of this post. Matching dates do not confirm which build it describes.
Build 25166359 · public branch
Steam updated · First observed