Interesting concept. I feel it would be better if the gap between those without the disorder was bridged. The game helped me understand the experience but not know the experience. It felt more like reading a medical textbook than a story.
More immersive descriptions of the world around and within would have helped. Having a character begin their journey into the disorder would help bridge that gap I speak of.
Example: What does it feel like to be outside of yourself? It didn't feel different in the story being outside or inside.