Hide and Seek
Brume Studio made their nightmarish horror game Hide and Seek in just fourteen days, but it'll creep you out for a lot longer. Trapped in a house and pursued by a madman, you strike a deal with a goat demon (don't ask questions) who promises to kill your pursuer if you can track down items with "cherished memories" and return them to it... before you're caught and killed yourself. Use [WASD] to move, holding left [shift] to run, and right-click to interact, hide, or talk to things, while left-clicking will let you blink away the hallucinations that can grip you. Through it all, you're being stalked by a killer, and when you hear him coming, that's your cue to run and hide or it's curtains for you.
So, yeah. Kind of like a less subtle Slender, but Brume Studios still makes it work surprisingly well. Though it might not make a whole lot of sense from a story standpoint, the concept and setup actually fits, I'd argue, with the whole surreal style, with the endless corridors and warped design capturing that vaguely disorienting feeling you get when trapped inside a nightmare. As polished as the presentation is, though, the gameplay is a bit rough around the edges. It's a bit too simple, and the slowness associated with hiding and blinking is maddening. Listening is a nerve-wracking experience on its own, since you need to hear to know when to hide from the killer, but since he stops frequently, it's almost too hard to judge when it's safe to come out, especially since you can't peep out from your hiding places to see if the coast is clear.
Despite that, however, Hide and Seek still manages to capture the frantic, over-the-top freakiness of our best bad dreams, and for its short development time, is a solid little way to spend a while making yourself jump.