That's so weird, I've never heard of this...
It's possible that I've fixed this bug as a side effect of working on whatever else since then, but I'll look into it. Thank you for reporting it!
And sorry... You might be able to play again by erasing your save file in AppData\Local\BE_Witches_20_08_2020, but it might just crash again...
Though, do you remember at what point exactly the game crashed? Right as you clicked on the save circle, or after a small delay maybe?