Platforms: PC and PS4
I actually feel bad putting this weird title so far down this list, but it just goes to show how strong the indie scene has been this year. Thumper is a psychedelic rhythm game where you take on the role of a space beetle braving a hellish void to confront a maniacal giant head from the future.
In its own right, this game is horrifying as there is nothing else like it out there. The lack of familiarity causes a great unease in the player, not to mention the sights and the bosses. To say any more would give away what exactly Thumper is, but one thing I will say is this: The less you know going in the better. It is one hell of an experience.