Finally played this demo. Creepy vibe but could not figure out the puzzle.
Thank you for playing and your video!
There are clues described in the books about how to solve the bookshelf. Furthermore, a hint option is possible in the journal. These hints were not the greatest in the version you played. I have improved them a bit since.
The chess board, you almost got it right by the end. Just flip the kings/queens. I am aware it can be frustrating. A guy suggested, I should make the pieces snap if they are correct placed. I will work on that.
The stove, you just needed to put in the paper and ignite it afterwards.
The key to the basement were on the desk, along with the smoking cigar 😊
You figured out the zodiac box, good job.