If I write something dark, it is not because I prepared for it. That's what my characters are made of. I just feel what they feel and sometimes cry along with them or resent myself for making up such a horrible thing. Then move on and a week latet say that... hmm... it is not even that dark...
My first impression is that it is hard to digest. I lost track by sentence 4 every time and had to reread a lot. It feels more like well written speech read from paper than what people would genuinly speak aloud.
I would say to lighten it up a bit. Add more movement, feeling. The concept is...