Basing your game on the story of Bluebeard was a really clever solution to the jam theme! I didn't think about using folktales/fairy tales as inspiration, but there sure are a lot of "forbidden doors" in those.
I love the visuals, especially the vertical orientation of the screen and the shaking hand animation whenever you encounter Bluebeard. I also liked the little surprise when you open the letter...
All of your Trijam entries I've played so far have been so unique! You have such a distinctive style.