Games like Biolum
Games like Biolum include Subnautica, Five Nights at Freddy's: Secret of the Mimic, Lethal Company, Half-Life: Alyx, and Subnautica: Below Zero. We matched them by the tags players give Biolum on Steam (Horror, Sci-fi, Exploration, Indie, and Action-Adventure): closest matches first, and among equally close ones the better-known games.

Subnautica
Shared: Horror · Exploration · Underwater

Five Nights at Freddy's: Secret of the Mimic
Shared: Horror · VR · Exploration

Lethal Company
Shared: Horror · Exploration · Sci-fi

Half-Life: Alyx
Shared: Horror · VR · Sci-fi

Subnautica: Below Zero
Shared: Horror · Exploration · Underwater

SOMA
Shared: Horror · Sci-fi · Exploration

Subnautica 2
Shared: Horror · Exploration · Underwater

Five Nights at Freddy's: Security Breach
Shared: Horror · Exploration · First-Person

Outer Wilds
Shared: Exploration · Story Rich · Sci-fi

Iron Lung
Shared: Horror · Indie · Submarine

Amnesia: Rebirth
Shared: Horror · Action-Adventure · Exploration

Starfield
Shared: Sci-fi · Exploration · Action-Adventure

The Callisto Protocol™
Shared: Horror · Sci-fi · Action-Adventure

Pacify
Shared: Horror · Exploration · Sci-fi

Escape the Backrooms
Shared: Horror · Exploration · First-Person

Still Wakes the Deep
Shared: Horror · First-Person · Exploration

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

Resident Evil Requiem
Shared: Horror · Action-Adventure · First-Person

Prey
Shared: Sci-fi · Horror · Exploration

Firewatch
Shared: Exploration · Story Rich · First-Person

Bendy and the Dark Revival
Shared: Horror · Indie · First-Person

STAR WARS Jedi: Fallen Order™
Shared: Action-Adventure · Sci-fi · Exploration

The Forest
Shared: Horror · Exploration · First-Person

Scanner Sombre
Shared: Horror · Exploration · Indie