"Buddy Simulator 1984"
The closest you can get to playing a living game. Buddy Simulator 1984 begins as a text-only game that eventually builds itself graphics. Anything to keep you entertained.

"A Normal Creepypasta Retrospective"
The video that introduced me to The Alternate Universe Pokemon Iceberg. It's just two sisters takling about their childhood experiences with creepypasta. Very normal :). You should watch it. Doesn't actually contain any anomalous games but has similar vibes.

"Misfortune.gb"
Creepypasta Wiki | Midnight Krick Video A short creepypasta about a secret game hiding in other games.

"Valle Verde"
This game is absolutley living, growing, and adapting. And it’s not a good thing.

"Creepy Dinosaur Game"
Youtuber Sagan Hawkes tracks down a lost computer game from his childhood. I can't say anything else without spoiling it, please go watch it!

"Basilisk" and "Basilisk 2000"
Play the games here: Basilisk | Basilisk 2000
Or watch a video about it by Sagan Hawkes
Expolre an unfinished SNES game and it's unreleased remake. Use the level editor to uncover secrets.