Games like Moonbase Lambda
Games like Moonbase Lambda include Outlast, Lethal Company, Five Nights at Freddy's, Monstrum, and The Outlast Trials. We matched them by the tags players give Moonbase Lambda on Steam (Indie, Survival Horror, Action Roguelike, Retro, and First-Person): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Survival Horror · First-Person · Horror

Lethal Company
Shared: Survival Horror · First-Person · Horror

Five Nights at Freddy's
Shared: Survival Horror · Indie · Horror

Monstrum
Shared: Survival Horror · Indie · Action Roguelike

The Outlast Trials
Shared: Survival Horror · Horror · First-Person

Five Nights at Freddy's 2
Shared: Survival Horror · Indie · Horror

The Binding of Isaac: Rebirth
Shared: Indie · Action Roguelike · Difficult

Alien: Isolation
Shared: Survival Horror · Horror · First-Person

Poppy Playtime
Shared: Survival Horror · Horror · First-Person

Ultimate Custom Night
Shared: Survival Horror · Horror · First-Person

Outlast 2
Shared: Survival Horror · Psychological Horror · First-Person

Slender: The Arrival
Shared: Survival Horror · Indie · First-Person

Amnesia: The Bunker
Shared: Survival Horror · Horror · First-Person

SOMA
Shared: Psychological Horror · Survival Horror · Horror

Five Nights at Freddy's 3
Shared: Survival Horror · Indie · Horror

Five Nights at Freddy's 4
Shared: Survival Horror · First-Person · Horror

The Binding of Isaac
Shared: Indie · Action Roguelike · Difficult

PANICORE
Shared: Survival Horror · Horror · Psychological Horror

Content Warning
Shared: Action Roguelike · Horror · Indie

Amnesia: The Dark Descent
Shared: Survival Horror · Psychological Horror · Horror

Escape the Backrooms
Shared: Survival Horror · Horror · Psychological Horror

Resident Evil 7 Biohazard
Shared: Survival Horror · First-Person · Horror

Five Nights at Freddy's: Sister Location
Shared: Survival Horror · Horror · First-Person

Backrooms: Escape Together
Shared: Survival Horror · Psychological Horror · Horror