The synopsis of The Last Astronaut had me sold that this was the book of my dreams.  Horror in space is my jam.  Alas, either my expectations were unreasonably high or the story was reasonably boring, but something was missing here.

I will preface by saying that the research included in the crafting of this story is impeccable.  The author did confess in the author's note to interviewing two astronauts to research his story which is (a) really freakin' cool and (b) obvious in how believable the science and technology are.
Also, the overall format of the book is creative and tickles my brain with its cleverness.  The Last Astronaut is the name of the fictional book within the story that we are supposedly reading, therefore including us as readers in the story itself.  So cool.

However, I wasn't sold on a few elements.

Namely, the horror.  This is a sci-fi horror book and, even as a baby horror reader, I never once felt fear or anxiety.  The descriptions were too intellectual and lacking the visceral connection of both the characters to their environment as well as the reader to the characters.

Which leads me to the characters, because there were simultaneously too many and yet not enough.  The book is written with multiple POVs which randomly switch throughout the individual chapters.  I found this confusing and also quite odd considering the book's title - why the focus on so many characters?  And yet there weren't enough characters to make the storyline as epic as it attempted to be.

My final note is a spoiler. 

The astronauts came through 2I's butthole.  This is never directly addressed which is hilarious and frustrating.  It also leads to other questions, such as does 2I's butt randomly rotate?  Or only when it's irritated by an outside breach?  Because let's be real, that would make anyone twitch.