In the other reviews, many people have already stated what I agree with concerning this piece of work; that its use of the epistolary or ergodic structure lends to its unique feel, connecting it to other great works with a larger scale such as House of Leaves, cementing the online story as a cornerstone of an evolving genre of writing that pushes boundaries more through the years and catches more fans as time goes on. But one detail I never see discussed online is well... how online the story is. The livejourney parts of the story, the expansive email archives, the outside links all are fantastic, but this isn't where the rabbit hole ends.
The Dionaea House - and subsequently many nontraditionally published horror stories and concepts - do not exist in a vacuum, and more importantly, are not subject to copyright laws. Think of Slenderman as an example. What began humbly on the internet as a horror photo editing exercise morphed far beyond the one creator, and even the original platform. The way audiences and communities slowly, and then quickly warped and fed the monster (metaphorically) the more it became a hive mind. Not controlled by a single writer, or maybe a studio, the beast was changed by all who touched it. I see the Dionaea House similarly, though to a lesser extent. In the comment sections of journals, entries, and blogs, the community fought to establish the canon they sought to see. Creative minds struggled to become part of the story, for better or worse. Some claimed to know the exact house, knew the people and places, even in one or two extreme cases used the comment section to display their own writing ability for entirely unrelated stories. (Did anyone else see the wild comment about a man who ate birds, a la Renfield from Dracula??)
For decades and decades of film, television, books, most forms of media, people may comment on them, write in the universe, make fan versions and unsanctioned sequels, but never in the same space as the original. If someone thought that Leia and Han shouldn't have ended up together they couldn't have edited the movie to make their voice heard. Books with fan material won't be republished to reflect a single reader's ideas. But in the internet space, this is a physical reality. Below these livejournal posts are hoards shrieking to be heard. And beyond a few platforms that allow for comments to be turned off, this is an understood reality for many exclusively online pieces of fiction writing.
I would be wildly interested to see someone take this idea and run with it, make multiple accounts to interact in the same space, to tell a seemingly organic story. If this already exists, I hope I'm made aware of it soon. In many ways this is happening in other ways, unlisted YouTube videos come to mind when used in ARGs, secrets hidden in HTML code, the whole nine yards.