Enjoying horror games without any sound is difficult, but not impossible, and while spooky atmospheres rely on ambiance to build tension, there are plenty of stories that can still be told even without impeccable sound design to set the scene. It's a common belief that a lack of sound can make horror games less immersive which is true to an extent but it entirely depends on the sub-genre and the context, as certain games rely more on visuals to craft a narrative and not strictly soundtracks or SFX.