I don't work at Oxtord Games but I can try and help you, but first I need to ask you some questions since I never had this problem:
1-When did you install windows?
2-When did you install the game?
3-Does he chew?
4-If you managed to get a dark level and got it right, does it stay dark and come back to light only when you get it wrong?
You can reply here or on discord Lino#5541, I hope I can fix your problem.