It’s called UnderTale, and it’s A game where you are trapped in a new world called the underground, and you can either kill every monster in order to collect their souls and break the barrier to get out, or take the Pacifist route and become friends with everyone in order to break the barrier and get out. You are a character that is genderless. You can name the character whatever you want. Sometimes you can name the character by the name that the creator gave it, Toby fox. If you take the pacifist route, you can name your character frisk, which was the name that the creator gave. You can give the genocide route the name Chara, Which is the name that the creator gave it.

Sorry for the long explanation.