The Occult Case

In The Occult Case you play as an investigator working for the government to destroy evil supernatural beings invading our world. You are given a case where you need to kill a devil haunting a mansion; when you enter you get trapped within the devil's domain, where you must find him or be trapped for eternity and succumb to your madness. You make deals with devils in order to gain powers and challenge altars to become stronger.

The roguelike structure uses spatial aberrations in the form of room changes that do not make sense, where backtracking is impossible, and supernatural shadow beings haunt the rooms and must be fended off.