Games like Lunar Nightmare
Games like Lunar Nightmare include Dead Space, Dead Space (2008), Alien: Isolation, SOMA, and Prey. We matched them by the tags players give Lunar Nightmare on Steam (Horror, Action, Adventure, Sci-fi, and Retro): closest matches first, and among equally close ones the better-known games.

Dead Space
Shared: Horror · Sci-fi · Space

Dead Space (2008)
Shared: Horror · Action · Sci-fi

Alien: Isolation
Shared: Horror · Sci-fi · Space

SOMA
Shared: Horror · Psychological Horror · Sci-fi

Prey
Shared: Sci-fi · Horror · Space

STAR WARS Jedi: Survivor™
Shared: Action · Adventure · Sci-fi

ROUTINE
Shared: Sci-fi · Psychological Horror · Horror

Atomic Heart
Shared: Adventure · Action · Horror

Half-Life 2
Shared: Action · Sci-fi · Adventure

Outlast
Shared: Horror · Psychological Horror · Adventure

System Shock
Shared: Action · Horror · Sci-fi

Darkwood
Shared: Horror · Adventure · Action

Mouthwashing
Shared: Horror · Psychological Horror · Retro

The Beast Inside
Shared: Horror · Adventure · Action

Alan Wake
Shared: Horror · Action · Adventure

Still Wakes the Deep
Shared: Horror · Psychological Horror · Adventure

Observation
Shared: Adventure · Horror · Sci-fi

The Evil Within 2
Shared: Horror · Action · Psychological Horror

Escape the Backrooms
Shared: Horror · Psychological Horror · Adventure

The Callisto Protocol™
Shared: Horror · Sci-fi · Space

Little Nightmares II
Shared: Horror · Adventure · Singleplayer

Deliver Us The Moon
Shared: Adventure · Action · Sci-fi

Warhammer 40,000: Space Marine 2
Shared: Action · Adventure · Sci-fi

Resident Evil 4
Shared: Horror · Action · Singleplayer