As a whole, an enjoyable take on an interesting premise. The idea behind the book is much more interesting than the plot in of itself, which is both the fault of and a credit to the short and fast paced structure. 

All in all, the plot, however, is somewhat lacking. The narrow insight is suited for a POV from just one character who is largely an outsider to the rest of the world, but leaves a lot of sparse world building and plotlines to seem a little overlooked.

Luckily, the themes and ideas behind the whole thing are much more substantial and well thought through. 

More important that any aspect of the book isolation, though, is the afterword. 
After finishing the final chapter, with its abstract takes on daily life, reading the authors words about his own illness and mortality is so much more poignant than any extract from the book itself, except perhaps that final chapter. 

Not necessarily what I expected, but worth a read, all the same.