Highlands, Deep Waters

This game has a clear lovecraftian influence (particularly Call of Cthulhu but with an original setting in a small fictional town in Scotland) and manages to pull off a sense of disquieting uncertainty at points in the game very well. You're caught up in an increasingly dangerous series of events starting with a murder investigation and becoming ever more estoric and damaging to your mental state from there. If you enjoy games with a lovecraftian flavour, I recommend this one.