Games like He is Outside
Games like He is Outside include Outlast, The Outlast Trials, Escape the Backrooms, Five Nights at Freddy's: Security Breach, and Poppy Playtime. We matched them by the tags players give He is Outside on Steam (Survival Horror, Female Protagonist, Horror, Roguelike, and Stealth): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Survival Horror · Horror · First-Person

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

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

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

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

Alien: Isolation
Shared: Survival Horror · Horror · Stealth

Resident Evil Requiem
Shared: Survival Horror · Horror · First-Person

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

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

Buckshot Roulette
Shared: Horror · Dark · First-Person

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

Five Nights at Freddy's 2
Shared: Survival Horror · Horror · First-Person

Garten of Banban
Shared: Horror · First-Person · Survival Horror

Visage
Shared: Survival Horror · Horror · Psychological Horror

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

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

Hello Neighbor
Shared: Horror · Survival Horror · Stealth

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

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

CloverPit
Shared: Roguelike · Horror · First-Person

Dead by Daylight
Shared: Survival Horror · Horror · Stealth

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

Resident Evil Village
Shared: Survival Horror · Horror · First-Person

DEVOUR
Shared: Horror · Survival Horror · Dark