The radio in the treehouse might be relevant. See my sibling comment.

https://news.ycombinator.com/item?id=47961275

Yeah I saw that too, but the list of all accessible rooms is also in the code and the only scenes I see are

  default
  sauna
  tent
  cave
  treehouse
  house-main
  house-cafeteria
  house-bedroom
  house-trophey
  boat
  telescope

It would be really cool if there were some secrets, but alas it appears not (unless it's obfuscated in the source as well)