I really like the contrast with the cute pixel arts and scary atmosphere. I was stuck when I found the code, and I had to read the comments to know that the code was for the chest. Maybe it should have been told to the player when they discover the chest that they need a code. Also the end felt a little sudden in the room behind the strange door with Mr.Hibou. It didn't feel right for me to end like that.
Otherwise, the game is very good. I love the art and details you put in the different rooms. Well done!