The lighting and mood in this experience is fascinating. I was a bit sad when the music stopped, but I also liked the other sound effects, even the footstep sounds. They were an interesting contrast, felt so normal and real compared to the surreal visual surroundings.
For me, walking simulators are fine, but I would have liked to be able to explore a bit more. Being able to leave the path was interesting, but it would be more interesting if there was something I could only reach or see/experience by leaving the path. Same with the object I would have liked to inspect at the end of the game. The experience felt incomplete.
I absolutely like how you let the player interpret what they see here and what's going on, really! I just would have liked to see and experience more of it.
Looking forward to more of your experiments, and to be honest, I rather see an unfinished experiment to be shared, than none. :)