I don't know if this is just something you haven't yet gotten to in that case i'm sorry for repeating what you already know, but i'm playing this game while logged into my account, I got into my account before I made the save and i stayed in my account until i saved and left, I closed the tab came back maybe 2 days later now and my entire save is gone.  i really do love this game but it's horrendous constantly having to redo literally everything especially when you've almost finished getting the entire green island like i had. I hope you can find a way to fix this soon and while i don't know much about the logistics of this all i'd propose maybe you could try to do a sort of account thing in the game sort of like how aground did it after they made a demo that wasn't on armor games. I don't know if it'd work or is feasible for you but I think it'd be a possible fix. the game otherwise is great and I truly do love playing but I have to take breaks a lot cause the constant vanishing of all progress is just tiring. good luck of fixing this and i'll check back in maybe a month or two.

this. i've experienced this problem to the point i stopped playing lol. its been like this for awhile now, a few months for sure and maybe even a year or two, im unsure. i really do hope we get an actual functioning save button soon, otherwise i wont be able to play, and this is only one of the few games i've enjoyed on itch.