There is no "quit game" option and the saves get deleted as soon as you alt+f4.
If you can't load your save file run the game as admin (it happened to me)
running with admin worked for a bit, now it cant read my save no matter what...
There is no need to run as administrator. I found out how approximately it works:
1. You launched the game first time and are trying to load a save. And the save tells you: “okay, now I’ll load it”
2. You launched the game second time and are trying to load a save. And the save tells you: “today, I think I’ll also load it for you, dear player”
3. You launched the game third time and are trying to load a save. And the save tells you: “I’m tired today, so let’s load it sometime next time.” Solution: open the game again and try to load and it will load. If it doesn't work, restart the game and try again.
Some times the game starts, the save works.
Some times the game starts, the save doesn't works.
This is how it works for me