Spoilers below:
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This was a really well-crafted game, well done. The writing was punchy and the central hook of the deaths was compelling. Once you figure out the premise, probably at some point in Act Two, there's a sudden huge momentum and all the pieces fall into place, and it was very satisfying to revisit some older entries and recontextualise them.
There was one odd plot point I didn't quite get. It seemed like the main "haunting" was going to come from something relating to Oswald and Rupert's sister, iirc called Eleanor. Instead, she's remembered perfectly well to the end, and that whole thread of information seemed at best a red herring. It's odd that a character you get no real information on, Amelia, is "patient zero", and odd that Rupert remembers her only after years, with no context to who she was or why the player should care about her. Was there some chain before Amelia or was she the first? Why her? Is Dvorak's Humoresque a particular clue or joke? It was odd for Oswald to talk about ghosts getting into Martha and so on - the actual curse appears entirely unrelated to the house and just ended up with the Galleys by chance.
I'm not sure I understood John's motivations at the end. Initially I wanted to think he'd solved the case after talking to Annie at the Chapel, and when he realised the thunderclap had claimed Katherine, committed suicide to stop the chain spreading further by him accidentally remembering Katherine in future. On re-reading, I think this was an overly optimistic assessment - John has no idea whether Katherine had any further family (indeed, he couldn't possibly know, he would have forgotten everything about her...), and it seems likely he committed suicide thinking he'd had a mental breakdown and killed a house full of people or something similar.
I also never solved the hangman - it seems to reject every letter of the alphabet. Does it not have a solution?