See that rabbit on the cover who's zoomed in on in the first update? That happens to be Ruby.
When the Animal Crossing villager was announced for Super Smash Bros. Wii U/3DS, he quickly gained a memeticreputation that wouldn't be out of place in this story.
The reveal that the "summer camp" is on an isolated island becomes this with the release of Animal Crossing: New Horizons, which has an isolated island as the main setting.
Narm: Seeing as how 80% of the story's images are unedited screenshots of the game, it's very funny seeing the narration describe the gruesome things that happen to Billy followed by a completely innocent screenshot of an Animal Crossing villager planting digging for fossils or talking to a cute animal villager.
Nightmare Fuel: You'll never look at this game the same way again.
The horrific deaths. "Tom died alone and unloved in a hole like an animal."
Just about everything involving Penny. "Come on Billy, this will be fun!"
Nook's journal. Especially how Tom Nook is shown steadily losing his mind due to the gyroids' influence.
Penny's last balloon letter. Made even creepier after your second read through, when you know who "Penny" really is.
One-Scene Wonder: Mr. Resetti appears in the anti-box ending to yell at Billy for attempting to commit suicide and give him a life lesson.
Squick: Penny rips childrens' bodies apart, using them to replace her cancer-ridden body parts? Disgusting.
Tear Jerker: "Tom died unloved and alone in a hole like an animal."
The entire anti-box ending is either this or Nightmare Fuel. "I'm coming, Penny. I love you."