[2021] MOVED: The game progress has not been saved.

Originally posted by Ленка-пенка: Do game developers drop in here?

It's a problem on your end, therefore devs wouldn't be able to help.

Game Progress is stored on your PC and in the Steam Cloud (if Steam Cloud is activated). Those files probably have been overwritten or got deleted. This could have many reasons, and your chances for getting your old save back are really low. In the future, back up your saves.