Quite an impressive piece of work. One of the things I was most interested in was how the book itself succeeded in making me anxious, which is to say, made me feel the protagonist's anxiety as life is sort of rushing at him from all directions. At one point, I almost didn't want to keep reading, because it was too hard to maintain my separation from the story.
Also, Ms. Moon can write. I love the parallax view of Lou's view of Mr. Aldrin, and Mr. Aldrin's view of Lou.
That said, I did think the characterizations were a little one-dimensional, and would have liked people to vary from their assigned roles as heroes and villains a little more. Which I think was why I liked Aldrin so much; he's complex, and has moral weaknesses and strengths.