The game is more about the exploration and the emotional storyline than anything else, so just relax and let it lead you.
Most of the game consists of interacting with certain objects and people in the world marked by icons. Look for them to keep progressing through the game.
Sometimes these icons will disappear, but all you need to do to find them again is to simply move your head.
The game also offers the ability to play the chapters individually, which means you can re-play some of the greatest moments in it if you wish.
Be warned that the game is not for those light-hearted. It’s very emotional and difficult from time to time.