Doki Doki Literature Club was a surprise hit last year. According to Steam reviews, you should play it if you like, uh, anime and giving yourself emotional pain.
I really liked the way Doki Doki Literature Club got under my skin. Despite its pleasant, moe-tinged veneer, it's not just a scary-arse game, it also contains a touching story about depression. Steam users seem to agree with me, but they can't agree on who is best girl (it's Yuri).
You can check out more reviews for Doki Doki Literature Club here.