A couple months late, but I just finished playing Hellblade: Senua's Sacrifice and I'm really tempted to say this is the 2017 GOTY. Games with hard/serious/adult subject matters are too rare, games that do it without even once cutting corners, sacrificing art direction, or using tired tropes are even more rare. This is a gem of a game.
Action/puzzle, has violence, is centered on mental health issues and trauma.