Games like The Complex: Found Footage
Games like The Complex: Found Footage include Firewatch, Layers of Fear (2016), Outlast, What Remains of Edith Finch, and Poppy Playtime. We matched them by the tags players give The Complex: Found Footage on Steam (Horror, Psychological Horror, Singleplayer, First-Person, and Multiplayer): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: First-Person · Singleplayer · Walking Simulator

Layers of Fear (2016)
Shared: Horror · Psychological Horror · First-Person

Outlast
Shared: Horror · First-Person · Psychological Horror

What Remains of Edith Finch
Shared: First-Person · Walking Simulator · Singleplayer

Poppy Playtime
Shared: Horror · Singleplayer · First-Person

Visage
Shared: Horror · Psychological Horror · Multiplayer

Escape the Backrooms
Shared: Horror · Psychological Horror · Multiplayer

SOMA
Shared: Horror · Psychological Horror · Atmospheric

Subnautica 2
Shared: Horror · Multiplayer · Exploration

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

Amnesia: A Machine For Pigs
Shared: Horror · Psychological Horror · First-Person

Ready or Not
Shared: Singleplayer · Horror · Multiplayer

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

Phasmophobia
Shared: Horror · Psychological Horror · Multiplayer

The Beast Inside
Shared: Horror · First-Person · Multiplayer

MiSide
Shared: Psychological Horror · Horror · First-Person

Outer Wilds
Shared: Exploration · Mystery · Singleplayer

Slender: The Arrival
Shared: Horror · First-Person · Psychological Horror

Dark Deception
Shared: Horror · Singleplayer · Multiplayer

Inside the Backrooms
Shared: Horror · Psychological Horror · Multiplayer

Buckshot Roulette
Shared: Horror · Multiplayer · First-Person

Subnautica
Shared: Horror · Singleplayer · Exploration

No, I'm not a Human
Shared: Horror · Psychological Horror · Singleplayer

Little Nightmares II
Shared: Horror · Singleplayer · Psychological Horror