The horror elements of this book are certainly second-rate, derivative, call it whatever you want, they don't add up to much except a few gross-outs and jump scares that seem made for a B-movie rather than a novel.  However, the central relationships, between two bullied kids, and then, as the book turns, the bullies themselves, are well turned, and the environment, both manmade and natural, feels real and well-occupied.  We run around and around it with our leads and never get lost.  I would be interested in a book that's just about people in these environments! The horror elements do very little here.