I did hesitate between 4 and 5 stars - but then, when in doubt, be nicer ;) I did thoroughly enjoy Project Hail Mary - loved the premise, plot and characters, but a couple of plot points required a bit more suspension of disbelief than I would have liked. That said, many "coincidences" are explained in ways that make sense, which I liked; I also thoroughly enjoyed the linguistics part of the science-y bits :)