This mod is not perfect though since it still takes things from other mods, but I would recommend trying it. (If I remember correctly at least one of the people involved with the mod were involved with the development of the main Containment Breach game.) This mod is still in development, but from the trailers and demo it appears that it might be good. This is called one of the greatest free horror games and for good reason. If I had to compare it to another horror game I would use Silent Hill as an example. It focuses on ambiance rather than straight up horror and knows how to use sound effects (a good example is that it plays a mildly spooky sound when a body falls from the ceiling, but uses the loud jumpscare sounds for an appropriate event such as staring at 096's face or 173 being right in front of you). This mod has stopped development for now, but it can best be compared to Ultimate Edition.