Games like Frostbite
Games like Frostbite include Firewatch, Five Nights at Freddy's: Security Breach, The Forest, Outlast, and Poppy Playtime. We matched them by the tags players give Frostbite on Steam (Atmospheric, Adventure, Horror, Survival Horror, and Thriller): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Atmospheric · Adventure · Walking Simulator

Five Nights at Freddy's: Security Breach
Shared: Horror · Survival Horror · Singleplayer

The Forest
Shared: Horror · Adventure · Survival Horror

Outlast
Shared: Horror · Atmospheric · Survival Horror

Poppy Playtime
Shared: Horror · Singleplayer · Survival Horror

Lethal Company
Shared: Horror · Survival Horror · Atmospheric

The Long Dark
Shared: Atmospheric · Adventure · Singleplayer

SOMA
Shared: Atmospheric · Horror · Survival Horror

Subnautica 2
Shared: Horror · Survival Horror · Adventure

What Remains of Edith Finch
Shared: Atmospheric · Adventure · Walking Simulator

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

Visage
Shared: Horror · Survival Horror · Atmospheric

Resident Evil 7 Biohazard
Shared: Horror · Survival Horror · Atmospheric

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

The Beast Inside
Shared: Adventure · Horror · Survival Horror

Sons Of The Forest
Shared: Survival Horror · Horror · Adventure

Fears to Fathom - Ironbark Lookout
Shared: Atmospheric · Horror · Adventure

Choo-Choo Charles
Shared: Survival Horror · Horror · Singleplayer

Layers of Fear (2016)
Shared: Atmospheric · Horror · Walking Simulator

Subnautica
Shared: Horror · Adventure · Singleplayer

Escape the Backrooms
Shared: Horror · Survival Horror · Adventure

Stray
Shared: Adventure · Atmospheric · Singleplayer

Slender: The Arrival
Shared: Horror · Survival Horror · Atmospheric

Little Nightmares
Shared: Atmospheric · Horror · Adventure