I thought it was alright. I loved the theme park aesthetic and setting, and what an incredible amount of work went into making the park feel like it could be a real park (seriously, including an illustration of the park's map was phenomenal), but I felt like the plotline that described this world struggled under the weight of too much lore, and not enough to engage the reader on a moment-to-moment basis. The main character is very contemplative, and there's a lot of emphasis placed on anecdote and building providence to every detail of the park, e.g. "This lamp-post is famous for being where an unsanctioned wedding took place, so it's called the "Wedding Post", here's my experience of how that legendary event went down", but it kind-of started to get exhausting for me, and I found myself trying to skip ahead to when the plot starts actually moving. For me, when there's a story about a really interesting location, I want to be able to explore it in an organic way, but the MC has so much history with Whirly World that sometimes I feel like I'm watching someone else enjoy something, and I'm sort-of backseating.
Of interesting note, there is also attention to geographical consistency between setpieces: "attraction X is visible from attraction Y", or "I walked west from store X to reach location Y". I imagine this was done so you can follow the MC's position on the map, and to make it feel... consistent? My point is that the park itself seems to have been created first, and the plot is just a vehicle for showcasing all the major locations, rather than be the star of the show. Honestly, that's fine, and a lot of people will appreciate the detail of the park, but I felt like I was in this weird limbo where the plot and setting were fighting each other for screen time.
As someone who has their own themepark they daydream about, it's interesting to see what effect this approach has had on the reader's experience. I almost wonder whether a different medium, like art, or a comic, would've better illustrated what the park the author wanted to show. Beyond that, a theme-park is often cited to be a fantastic recreation of childhood, and Whirly World's philosophical musings seem to be interested in the idea of "moving on", through it's depiction of ghosts and people at an age where they are stuck thinking about their past. I thought the ending was satisfying, though, and it's worth reading if you are interested in theme-parks. For a first book, it's definitely an achievement, and we love those.