For those who don’t know, Undertale is a one-man RPG project from Toby Fox, who clearly was inspired by RPG Earthbound and Moon: Remix RPG Adventure when developing & coding this treasure. You play a kid who falls into an underworld filled with monsters, and it’s up to you to either befriend them or kill them. And that’s all I can say without spoiling the game. Even up to now, the whole game is worth a few playthroughs just because of its rich characters, setting, and unique gameplay and subversions of certain mechanics.
Oh, and once you’re done with the game, do check out the 5th anniversary concert below. It’s good stuff.