It's an incredible, heartbreaking journey. And it absolutely is groundbreaking. There are plenty of indie games that have unique, creative mechanics and art styles, and that can be interesting. And of course games (AAA and indie alike) have been experimenting with new ways of telling stories since the dawn of the medium. But I've never seen a game (indie or otherwise) that takes advantage of the medium's ability to force players into someone else's perspective the way that The Last of Us Part II does. It asks its players to inhabit two opposing viewpoints, two perspectives that cannot be reconciled. It causes as much conflict within the player as it there is on screen. It's brilliant.