Games like Extinction
Games like Extinction include Five Nights at Freddy's: Secret of the Mimic, Firewatch, Five Nights at Freddy's: Security Breach, The Forest, and Amnesia: Rebirth. We matched them by the tags players give Extinction on Steam (Adventure, Horror, Atmospheric, Action-Adventure, and Exploration): closest matches first, and among equally close ones the better-known games.

Five Nights at Freddy's: Secret of the Mimic
Shared: Horror · Adventure · First-Person

Firewatch
Shared: Adventure · Atmospheric · First-Person

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

The Forest
Shared: Horror · Adventure · First-Person

Amnesia: Rebirth
Shared: Action-Adventure · Horror · First-Person

Stray
Shared: Adventure · Atmospheric · Exploration

SILENT HILL: Townfall
Shared: Adventure · Horror · First-Person

Subnautica
Shared: Horror · Exploration · Adventure

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

Outlast
Shared: Horror · Atmospheric · First-Person

Lethal Company
Shared: Horror · First-Person · Exploration

Subnautica 2
Shared: Horror · Exploration · Adventure

Fallout 4
Shared: Adventure · Exploration · Atmospheric

PEAK
Shared: Adventure · Exploration · First-Person

Little Nightmares II
Shared: Adventure · Horror · Atmospheric

Outer Wilds
Shared: Adventure · Exploration · Atmospheric

Scanner Sombre
Shared: Horror · Adventure · Exploration

What Remains of Edith Finch
Shared: Atmospheric · Adventure · Exploration

SOMA
Shared: Horror · Atmospheric · Exploration

MiSide
Shared: Horror · First-Person · Atmospheric

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

The Long Dark
Shared: Atmospheric · Exploration · Adventure

Hello Neighbor 2
Shared: Adventure · Horror · Action-Adventure

Choo-Choo Charles
Shared: Horror · First-Person · Singleplayer