Der Astronaut

Good:
The plot twist around Ryland's amnesia is great!
"Space amoeba" story done right.
Relationship between Ryland and Rocky is endearing.
Audiobook elevates the whole experience.

Bad:
Protagonist with amnesia trope has been done before.
Rocky has interesting alien physiology & boring human psychology.
* Earthbound story-line and characters seem childish & oversimplified compared to science in space sequences.

Definitely a worth while read. I'm glad he did not get back to Earth. It's better left to the reader what happened after saving Rocky.

I think this will be the book I recommend the most this year. It is entertaining from beginning to end. If you like sci-fi or space stories, read it. If you don't, read it anyway because you will laugh. It is very rare that I tear through a book in the span of a day, but, and I apologise for the cliché, I could not put this book down.