I literally just bought Hollow Knight yesterday for $15 after hearing it get raved about. So congrats on crushing me value wise
I really want to start playing it (I love Metroidvania genre), but I'm really digging Batman Arkham Knight which I started a week ago, going to finish that first.
Regarding Arkham Knight, I bought it years ago but got turned off by the Batmobile controls right at the beginning of the game, then read a bunch of reviews where people said the batmobile was awful and a major pain, so I switched to a different game. Finally playing it now, while I still don't love the Batmobile, and it is forced on you every couple hours for a 10 minute stretch, it isn't really THAT bad, and the rest of the game is top notch, particularly the story/storytelling. Very glad I went back to it.