Searching for something unsettling rather than terrifying for the Hallowe’en period, I happened upon Parasomnia by Acatalept. It’s perhaps best described as a futuristic chrome version of the Theseus and the Minotaur legend.
Except you’re not Theseus. Theseus hacked the game by bringing in a ball of string, killing the Minotaur and escaping. You’re (currently) one of the preceding generations of Athenian youth sent in as sustenance for the monstrous Asterion and doomed to die.