It reminded me of some horror ARG (?) that I can't remember the name of. Basically the storytelling was in the format of going through developing tools of some unreleased video game. I can't remember all the details, only that developing crew went insane, which was shown in these game files. The game had medieval/fantasy vibes, similar to the game Gothic or TES. Featured low poly graphic just like in the video, and if I remember correctly, one part of that game was actually "playable" through NES (or was it SNES?) "emulator" but it wasn't an actual emulator, just carefully crafted exe to mimic one.
Does anyone know what I'm talking about? Sorry if it's extremely vague, but the ARG was popular a year or two ago, so I'm thinking someone might know what it is. Googling shows me generic stuff like Petscop or Catastrophe Crow, but it's not what I'm talking about at all.