This was a fascinating story whose stylistic conceit took me a while to get into. I eventually realized that, yep, the entire book was going to be in this archival style and it worked pretty well overall. I found the story compelling, although the characters were...possibly done a disservice by the novel's style and felt a bit flat. I get Neuvel's choices and, in particular, I think some of the twists would not have worked nearly as well had we had any access to the character's interiority, but that did come at the expense of fully realized people.
Still planning to read the next one; the premise is certainly creative enough to stick with it.