So I played Undertale.
Like many people, I took a while to get around to it mostly because the overwhelming level of hype was putting me off a bit. I wanted to experience it on my own terms. That, combined with my first impression from what I'd seen being that I'd probably find it to be a charming little game, but that I wouldn't get as much out of it because I don't really have any nostalgia for 16 bit RPGs.
I went in as blind as possible, only really knowing the thing about "you can finish it without killing anything". Whenever a game attempts that, it does increase my interest in it a bit (Mirror's Edge is so much better on a pacifist run).
So I did manage a pacifist run, with only a handful of vague hints from a friend of mine to get the best ending.
This game is fantastic! The characters are charming and well handled, the whole thing has a ton of personality, and there's a lot more depth to the experience than I was expecting. Without spoiling anything, there are some very clever ideas at work too. It may well be one of my favorite games of 2015 now.