This book was my favorite read from last year. I love Weir's mixture of researched scientific detail and irreverent humor, which he also exhibited in my other favorite novel of his, The Martian. His protagonists are down to earth even while being literally anywhere else, problem solve while facing extreme and dire straights, and use humor as a defense mechanism in very non-humorous situations.
Though he writes in a similar style to The Martian in Project Hail Mary, the feel is very different. Without spoiling any details, unlike The Martian's straight forward survival story, PHM has a non-linear narrative, a slowly revealing mystery, epic stakes, and more classic pop sci-fi elements. My wife and I listened to this as an audiobook in the car together, enjoying the tension, the creative problem solving, and the witticisms throughout. If that sounds like something you're into or if you enjoyed The Martian, you should pick this one up.