The game when you don't have to kill anyone.

Undertale is an independent role-playing game created by developer and composer Toby Fox.

In this story, humans and monsters coexisted on earth until a war was unleashed by sealing monsters underground.
Frisk, the human child you control, falls into this world and is then rescued by a friendly monster with a goat appearance named Toriel. Later she becomes a Boss when you try to return to the human world.
Why do I find this game interesting?
It'ss because it teaches you that the decisions you make have future consequences, and I'll explain that.
You can complete three routes: pacifist (you don't kill any monster), hard (you kill the monsters) and genocide (you kill monsters and Toriel)
In the last two the game ends in the confrontation with Toriel, but if you take the pacifist route you can continue with any problem.
It isn't easy to "fight" with them in the pacifist route either. You have dialogue and act very prudently.

In short, I like it because it's a different way to confront "enemies" and continue the story using logic and reason.