I downloaded this when it was cheap on kindle, and read it during a recent hospital stay (not sure that is relevant but I was a bit drugged up when I read it! )
I'm not sure what I made of it - it was very readably written, and I quite enjoyed the setting. I found parts of it haunting and memorable, but overall the ending left me feeling unsatisfied and slightly cheated. (And it didn't really hang together plausibly for me - the reasoning behind the catastrophic event wasn't credible for me)
I think I would have loved it when I was a teenager - I am guessing it is aimed at young adults, and it captures a lot of the angst of the teenage years - maybe its one you have to read at the right age?
Have passed it on to my 20 something DD for her views !