The core concept, of being "trapped" in a house and experiencing the narrative through clutter inside and glimpses outside, I think is fantastic. It lends itself really well to a tightly woven story where every environmental element contributes. I'm a little less keen on the horror elements; fears manifesting as monsters has, well, been done, and it muddies the presentation of agoraphobia by tying it to other, unrelated mental illnesses. A story that's more grounded in real-life paranoia and self-doubt could feel more true to life and potentially hit harder. I'd be interested to see an expanded take on the concept.