I liked your writing style, it's ornate and could appear heavy at times, but I think it serves the purpose of the story by making the experience mystical. I found it hard to see the theme in the VN, even based on distant definitions of the word expansion. But I guess that's the problem with a theme like this one, it's hard to see what others are seeing at times.
My biggest concern is that the clues given by the journals are a little too vague for my liking, so I quickly find myself having to spam the options to see the different possibilities, which isn't very interactive. Also, for the technical aspects, I've seen a lot of paragraphs sticking out of the textbox. There should be a way to avoid that by having more, smaller paragraphs. And it was a bit strange to see the sprites floating in the air too. Overall, I'd say it's quite a unique experience thanks to your prose and the general feeling of the VN, although I'm not sure what I've read!