Very interesting concept but due to the fact that the story is only a novella there was never really enough time to really flesh out all of the concepts. 
 I would have likes to have seen the relationship between the two characters evolving more through their interactions rather than being told their thoughts each time. I missed the characterisation in the book. 
 This was balanced out by some very interesting world building that really appealed to me. Again due to the length on the novel this wasn't developed as much as it could have been. I would have happily read a much longer novel about this world!