I just watched this documentary on Netflix, it was slightly depressing but shot beautifully. The soundtrack and filming are amazing. There's a dance sequence at one point where some of the kids are dancing/jerking and playing in all the abandoned homes from daylight>sunset>night to a nice song, and it's amazing!!! I wish I could find a clip of just that part to re-watch. I also didn't realize how close this abandoned town is to San Diego and Los Angeles.
This review is insightful, but I disagree about the author's conclusion saying that the dance sequences give the movie less impact. I loved the dance sequences, they were dreamy, lyrical and poetic. Fantasy and escapism is why I watch movies regardless if they are documentaries or fiction.