As an author, I love the fact that this story was so successful, while breaking some of the most substantial "rules" of writing. For example, I think there are more quotation marks in this paragraph than the entire book. Whether the choice to omit such basic elements of writing is intended to emphasize the dire situation of the story, I can't say. What I can say is that it isn't missed. It stands as proof that story triumphs over form or expectations.
As might be expected of an apocalyptic themed story, this book contains some disturbing imagery and descriptions that would not be suitable for young readers and the faint of heart.