Thank you so much for the indepth thoughts!
I felt so funny myself setting the letter like that lmao, I totally see the point but that one was a joke that didn't quite land.
The marinade clue was initially part of the secret table as a Special one listed for clarity, but I had to bite the bullet and leave it only on the room because of space and layout. It's a gamble: Players have to make that connection with the contextual hint of the letter to nail "the true ending", but 9 out of 10 the Bride and the Party are just killing each other.
And yeah, the Hollow Bride marinating herself is a deep irony, but maybe she already feels the need in her own body; that setpiece really helped cement the final solution.
Again, your thoughts are very kind and it really excites me to discuss this all indepth!