What an interesting concept of a story.
At first I would say I didn't like the characters, that they didn't act like humans... but the more I read the more I realized that yes, they are actually acting pretty much like tired and stressed human beings.
The plot? It really hits harder the further it goes, it really gets to be its own thing and ends up being quite the good reads.
I did have some problems understanding a few things (my english can fail somethings, I guess), yet I got the overall plot and its implications, specially the climax and the ending. So, yeah, all good here.
Maybe is not the most shaky over the top action novel ever written, but is a good drama, which what I believe it really tried to be.
It is a great novel for a first time author. Kudos!