Agree that this experience has a good and unique mood, the main room gives me Shadow of the Colossus vibes.
I think adding some geometric patterns to the floor in each room would help tremendously with navigation. It was often difficult to be certain that I was moving somewhere since the floor is a solid color and no environment pixels were visibly moving on the screen. I thought the water was a wall at first because it's a big solid color with high contrast to the floor. I think texture or decorative patterns would help with all of the navigation difficulties.
But for creating an environment with a big, mysterious, and personal feeling, great job