Oh no, it should save your progress automatically.
If you're playing the web version, are you using private browsing mode, or using any add-on or settings that could have automatically deleted your browser data? Or perhaps manually deleted your browsing data? Any of those could have deleted the game save data.
I’m so sorry I missed this post of yours until now.😭
I have tested it on a freshly installed Chrome on Windows, and the game saves properly.
It could also be caused by external cleaner programs that automatically clears your browser storage data.
If you don’t have any of those, then it’s probably something else that I’d have to figure out.🙂
