I was a little thrown off by this project being labeled as a book, but my confusion was rectified pretty quickly.
Now this is interesting! Despite how little is really explained, I love the world building. The setting feels like a familiar one while also feeling like something I haven't really seen before. I also really like all the little implications and textures in the writing. Things like the protagonist having an "adventurous past," thanking his dog for being with him, the letter in the book... it all paints a vague yet vivid picture that really fascinated me.
And the format... well, I thought the formatting was super interesting. Getting to look at a myriad of things in the room and having them add their own little details to the bigger picture, as well as having them fizzle away as you finish reading the passages, is quite an interesting mechanical crutch. I also love how that whole fizzling thing and some of the details you learn smoothly tie into the lil' twist at the end.
I like it! Nice work.