At first I was taken aback by your report because I could see the line of code to immediately write the file to disk when saving, but it turns out I added it when I was developing Lost Paradise and never released an update for Silent Paradise with this improvement... I will do so as soon as I can test the rest of the game. Thanks for notifying me and I'm sorry you lost progress, that's always the worst thing that can happen.
I'm also intrigued about this crash you've encountered: would you mind going to "%AppData%\Dreamnoid\SilentParadise\Logs" in your File Explorer and copy/paste here the content of any text files? This way I could have a look at what went wrong and see if I can fix it. Thank you! :)