Games like Where It Happened
Games like Where It Happened include Poppy Playtime, Layers of Fear (2016), What Remains of Edith Finch, Firewatch, and Garten of Banban. We matched them by the tags players give Where It Happened on Steam (Horror, Indie, Psychological Horror, Walking Simulator, and First-Person): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · Singleplayer · First-Person

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

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

Firewatch
Shared: Walking Simulator · Atmospheric · First-Person

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

SOMA
Shared: Horror · Psychological Horror · Atmospheric

Outlast
Shared: Horror · First-Person · Psychological Horror

Amnesia: A Machine For Pigs
Shared: Horror · Walking Simulator · Psychological Horror

Sally Face - Episode One
Shared: Indie · Psychological Horror · Horror

Mouthwashing
Shared: Horror · Psychological Horror · Indie

Firework
Shared: Horror · Indie · Psychological Horror

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

Garten of Banban 2
Shared: Horror · Psychological Horror · First-Person

MiSide
Shared: Psychological Horror · Horror · First-Person

Little Nightmares
Shared: Horror · Atmospheric · Singleplayer

Bendy and the Ink Machine
Shared: Horror · First-Person · Singleplayer

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

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

Among the Sleep - Enhanced Edition
Shared: Horror · Indie · First-Person

From The Darkness
Shared: Horror · Psychological Horror · Indie

Little Nightmares II
Shared: Horror · Singleplayer · Psychological Horror

Buckshot Roulette
Shared: Horror · First-Person · Indie

Amnesia: The Dark Descent
Shared: Horror · Psychological Horror · First-Person

The Room Two
Shared: Horror · Indie · Atmospheric