Rolled back to the previous version. This should fix the issue where it seemed like all progress has been lost. It wasn't lost but the latest update (1st Jan) was looking for save data in the wrong location.
Please fully exit and CLOSE Steam, then reopen it. This should update the game. You should no longer see a GameHouse logo on startup and should have your old save data back, and Steam achievements should work again.
Please note that if you bought the game on the 1st-3rd of Jan 2026 that your progress will be lost unless you want to copy your savedata to a new location (see the Steam forums for more details). We are very sorry if this issue affects you.