Here are some of the games which I really liked and which I though fitted the Halloween mood for today! And don't worry no game breaking spoilers in here.
Sooo here we go...
While investigating the scene of a gruesome mass murder, Detective Sebastian Castellanos and his partners encounter a mysterious and powerful force. After seeing the slaughter of fellow officers, Sebastian is ambushed and knocked unconscious. When he awakens, he finds himself in a deranged world where hideous creatures wander among the dead.
Facing unimaginable terror, and fighting for survival, Sebastian embarks on a frightening journey to unravel what’s behind this evil force.
Ellen Ripley’s daughter, Amanda enters a desperate battle for survival, on a mission to unravel the truth behind her mother's disappearance
Among the Sleep
Among the Sleep is a first person horror adventure, in which you play a two year old child. After being awoken abruptly by some strange force you explore the eerie house while looking for comfort.
Corpse Party [Games]
Play in this order: Corpse Party>Corpse Party: Book Of Shadows>Corpse Party: Blood Drive
Corpse Party revolves around a group of students from Kisaragi Academy, and one of their teachers. They perform a charm called Sachiko Ever After as an attempt to cheer up one of their classmates who is transferring to another school. But suddenly a massive earthquake occurs and drags them into Heavenly Host Elementary School. What's even worse: they appear in completely different dimensions inside the school
Mad Father [Free]
Help our protagonist, Aya Drevis to save her father from the devilish creatures crawling through the mansion.
The game starts with a girl named Aki (Or, should you beat the game once, a boy named Akito) who talks about how the tituliar character, Misao, has been missing for three months. Many of her classmates think that she had either run away or killed herself. Aki(to), however, hopes otherwise, for (s)he really wanted to be her friend. After a short introduction scene, the fun really begins.
TheBasil's creepy (at least for me) game recommendation list :p