[CW: discussion of suicide]
This is an unusual comment, but it's a reply to an unusual story, so I think it's appropriate.
Have you played The Beginner's Guide? It's a very good game. But there is something troubling about it, the details of which I will not spoil for you here. Players were left with at least a little reason to doubt that what they had witnessed was entirely fictional. And if it's not fictional, that changes what we should think of the game, and its creator. The game never fully clarifies this ambiguity, perhaps out of some sense of artistic verisimilitude, but it raises questions of player consent -- if it's permissible for the creator to cause the player distress over whether what they're seeing is real.
I do not feel as though I consented to what I was drawn into here. I have, in the course of my life, tried to talk down more than one person from attempting suicide, and witnessed many others whom I wasn't sure how close they were. It's for this reason that I took the conceit of your story very seriously until I was reasonably sure it was a fiction, and that took quite a lot longer than I would've liked. Some kind of warning at the start probably would have sufficed. You may feel that this breaks the fiction you've tried to create, but I hope that you will consider your responsibility to your players. You seem like a serious writer, and this is as serious a concern as any within the fiction itself.
That said...I thought it was very well-written. Kicking off what appears to be an ARG for a game jam is a bold choice, and I have to admit, I'm pretty curious about it.