Whirly World
I loved it. Whirly World is a self-contained adventure with a satisfying and thoughtfully created world. Jason is a great lead, and while you might not be obsessed with theme parks like him, his enthusiasm is infectious and refreshingly non-toxic. He loves that world, and his love and knowledge of the world helps him unravel the mystery of his afterlife.
Jason's inquisitive nature awakens the other ghosts in the park and they all have special talents that they need to use together to help figure out what's going on. My only real critique of the book is that I wish there was more of this. It's fun to see them work together towards common goals with their myriad “talents”.
I won't spoil the ending, but I'm always worried with a book like this where the mysteries involved are cosmic-level “what happens when we die” kind of stuff, that the book's answer won't be satisfying, or it'll be overly dogmatic in some way, but Brandon Jones does an excellent job tying things up without forcing any particular worldview on the situation. What's happening in the book is revealed but opens up a lot more interesting questions about the afterlife instead of trying to answer them all.
Very easy recommendation, check it out.