That was such a cute demo! I could really tell how much you like detective stories, and I'm curious to see what will happen next once you continue the story. Even just by how you placed the links was already adding some element of interactivity that just wouldn't have been there if this had just been a wall of text :D
I also liked your use of sounds to make the story more immersive, without those sounds taking too much away from the experience. The music felt fitting, both because there is a character in the story who plays piano and also because it reminds me of the music in certain Sherlock Holmes adaptations.
I'm guessing maybe the characters will uncover more and more Tarot cards as they're trying to solve the case? That would be intriguing, I love stories like that! :)
And drawing parallels between "The Hero's Journey" and "The Fool's Journey" is such a classic story structure.
Like with most Twine games, the most important part of the experience was the writing - and it was good! I instantly got curious about the characters and how they were fanboying about Sherlock Holmes, that was cute. And I really liked the funny moments as well. That part in the beginning where they played games made me grin from ear to ear. A nice way to make the characters instantly relatable!
There were some typos here and there but it wasn't distracting or anything, and it's totally normal when there's this much text over only a 10 day period.
Lastly, I really like the artworks you chose for the Tarot cards! I wasn't yet familiar with Imaginary Villain's work, but that was such a good choice :D