A rather literal (dry) and difficult book held together by moments of beauty.
I think the thing I disliked the most was how "unrealistic" the world felt. All worldships are conjecture at this point, but this one seemed absurdly unlikely. Who would plan a ship in such a way? Does the ship repair itself? Who is doing inspections to ensure safety systems? Do people understand how the baby star works? Are there robots that do maintenance task? Who inspects the maintenance work done? It just didn't hold. I found myself making up additional stories to explain plot holes.
I would much rather have had the "worldship" be some sort of large barge at sea (rising sea level plot?). Then I would have found it much easier to suspend my disbelief about the world, giving my full attention to the characters.