Sounds like cosmic fun for the whole family. It does seem like it may ask a lot of the player. I haven't given it a full play, but nice game design with cards.

Mark Z. Danielewskis House of Leaves is actually my favourite book and I'm very happy to find something here that was inspired by it!!! I've never thought about classifying the book as cosmic horror until now, but it makes perfectly sense with the unknown/unnamable horrors surrounding the house. One could even say: Cosmic horror par excellence. And a very interesting idea to turn the act of journaling the imaginary life inside the house into a game, thus mirroring the structure of the actual book!

The thing that I would suggest is, because it was hard to get into the mindset of your writing/instructions, to maybe have a more in-depth introduction for people who haven't read Danielewskis book. And I also did find the instructions a bit unclear written overall, but that might be because I've never actually played journaling games (although I'm a writer myself and it sounds like an interesting genre!). As LegionGames already commented, I too think that an example of a playthrough would be really helpful in understanding your game.

On another note, there is this conceptual video by Elli Koliniati on YouTube, called House Of Leaves Introduction videogame, which is a final project in architecture studies and in which a part of House of Leaves was turned into a video game. Idk if you've already seen this video, but if not, it might be inspirational or something :) - According to the video description, the author unfortunately doesn't want his book to be turned into another medium, which is sad, because the video game concept video looks very promising, but yeah.  And your journaling game definitely also proves, that his book theoretically could be turned into interesting game ideas!

Damn this is super unique! Would be really cool if you shared like an example of a "playthrough".