That's odd, Itch.io doesn't really do anything like that, it just lets you download the files really. GameMaker specifies where the save files are located, but I've no idea why it would put it on a different user account... Maybe some obscure setting on your side?
In any case thank you very much! This is wild, I've never ever seen a save get borked like that, this definitely seems to be beyond repair sadly... The only solution for the game not to crash on the loading screen might be to remove your corrupted save file entirely... I just tried crashing the game on purpose right as it's saving and even that couldn't replicate this issue, that blue screen must have really happened at the worst timing imaginable
I did consider adding a backup system before but that since I'd never seen corrupted / lost saves before, it didn't feel worth the effort. Since both you and someone else just had a save issue though, I'll work on adding that soon! It might be a bit primitive though, as in having to go in the save folder and replacing the files manually, but it's better than nothing
Oh that Sablee crash had an error! Damn, it really must have been a rare one then. I guess I've got some work ahead of me still...! Sorry I couldn't get your save back, but also, thank you!