Among the Sleep is a horror game that has a really unique approach to horror. But will you want to play this through ? In Among the Sleep you don't play as an adult but instead as a two year old child.
I have a theory that toddlers are closet drunks - they are always stumbling with poor limb control, babbling to themselves, being incontinent of bowel and bladder, and have extremely labile emotions. This game was evidence that it is not fun to be a toddler and this game was not fun to play.
...but I probably guess, you know that. Rather than a challenging game (although there are failure states), more of an interactive story in an uncommon and interesting perspective, reminding the player of childish fears. There's not a real lot of interaction going on, but enough to pull through for two hours - the slow pace of the game made me drowzee, to be honest. Nevertheless, one of the better "walking" (or rather: crawling and stumbling) simulators out there!