Undertale is basically a cultural phenomenon at this point. We've all heard Toby Fox's insane musical talent, we've all heard sans at some point. It's amazing.

Undertale is so good, because it turns the RPG formula on its head. You could fight battles, or you could befriend your enemies. The combat system is super unique, like little mini games within the battles. Each boss fight is super unique as well, with gimmicks that expand upon the formula.

The choices you make in this game are responded to on subsequent playthroughs, making you feel terrible about the actions you decide to make, knowing what coulr happen.

The music in this game is unbelievable. It's like a full course meal of music spread out, with all of the songs connecting to others with leitmotifs and character themes. Overworld themes like "Another Medium" and "Core are so smooth and exciting.

Undertale uses subtle humor that you don't quite get anywhere else, but packs a heartfelt story that pins your fate against the world.