I seem to be one of the few people who liked Andy Weir's Project Hail Mary more than The Martian. It's mildly spoilery to say that the xenobiological aspects are what I enjoyed the most. At other times I felt like I was reading someone showing their work on their physics homework, but if you've read The Martian you know what you're in for. To mildly plagiarize a review I saw elsewhere: if you liked The Martian, you will probably also like Project Hail Mary.

