general darkness and a very inadequate light source seems to be a recurring (almost mandatory, I'd say) trope.
another one I seem to remember from some game I can't quite place (but I can place in one movie: Signs) is half-truths, or incomplete action sequences.
namely, in Signs, there's a couple of scenes that make the viewer go "WHAT THE FFFFFFFFFFF!!!!!!!!!!", because they only show incomplete actions, that the viewer can't quite resolve, not *blurry* action that one can't identify, but *visible* (but, incomplete) action that one can't establish as a threat or out of place.
specifically, "the thing that moves among the crops", "the shadow atop the barn", and "the noises outside the house".
in those scenes, the thing that causes unrest is half-defined, we never see the complete picture: a foot and a leg that makes it's way into the crop line, in a way that implies a number of things:
-it moves, so it belongs to a living creature.
-it had been *outside* the crop line, and in that case "outside the crop line" implies "right in front of the protagonist", with the protagonist never realizing it.
-it had been right in front of the character, without making any noticeable noise or movement right until the point where it's discovered, which makes it even scarier.
the thing is right there, but the character (who is *actively looking for it*) doesn't see it, and most importantly, the viewer doesn't see it either, so the viewer finds out about it at the same time as the character, and can relate to the surprise through the expression of the character.
in the game I speak of, sometimes when entering new areas, a small cutscene moment would play where part of the scenery would shift, or partial images would flash passing by windows or corridors.
typical "blink and you'll miss it" moment, but never directly aimed towards scaring the player, it's always more of an ambient action, as if it was meaning to say "this place has a whole different idea of reality, and you're way out of your league here".
I can't remember the title, but I might be able to find it. I'll link it here when I do.