Total shot in the dark, but have you tried uninstalling and reinstalling? Sometimes frequently patched games end up with enough junk files that Stuff Just Doesn't Work (TM), and I've definitely noticed that Itch.IO's installer is at best kind of lazy about cleaning up after itself.
After saving the save folder of the working version on the desktop etc., uninstall the entire game and download the new 0.56v again,Why don't you install and restore the saved save folder and try to operate it?
