I'm not sure, but probably Ori and the Blind Forest.
This is one of the two games I was thinking of when I clicked into the thread.
Rayman Legends. Gorgeous looking game, fantastic soundtrack, fantastic gameplay and level design. I think I beat this game like 6 or 5 times lol.
This is the other game I was thinking of.
Both are beautiful games. As to why I think they're beautiful.... how does one answer that question? They just *are*.