Trying to start a new game or new game + simply provides me with a black screen, and since I can't load an old save either, I can't do anything with the game now. Making a save and loading it after this happens doesn't change anything.
Viewing post in Knightly Passions 0.37! RELEASE! comments
I've encountered this myself, and luckily, I worked around it.
When it happened to me, I was launching the game directly from the itch.io app.
When I opened the game folder directly and opened the game there, it worked as expected.
So try opening the .exe directly in the game files, if it still doesn't work, I'm sorry :<