Finished your game. I love the art style and the mysterious atmosphere in your game. The puzzles were quite difficult.
As you wrote, "You need to use your problem-solving skills and use your intuition," the game made me feel like I were completely on my own and had to think for myself. Wished there were at least some comments which give me some glues. I didn't actually know what to do and had to look permanently in the walkthrough.
It was still fun to play your game. Well done!