Games like Forget Her
Games like Forget Her include Amnesia: A Machine For Pigs, MiSide, No, I'm not a Human, Mouthwashing, and Layers of Fear (2016). We matched them by the tags players give Forget Her on Steam (Horror, Psychological Horror, Walking Simulator, Multiple Endings, and Story Rich): closest matches first, and among equally close ones the better-known games.

Amnesia: A Machine For Pigs
Shared: Horror · Walking Simulator · Story Rich

MiSide
Shared: Psychological Horror · Horror · Story Rich

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

Mouthwashing
Shared: Horror · Psychological Horror · Story Rich

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

SOMA
Shared: Horror · Psychological Horror · Story Rich

Phasmophobia
Shared: Horror · Psychological Horror · First-Person

Fears to Fathom - Ironbark Lookout
Shared: Horror · Psychological Horror · Exploration

Still Wakes the Deep
Shared: Horror · Psychological Horror · Walking Simulator

Summer of '58
Shared: Horror · Psychological Horror · Walking Simulator

Crimson Snow (2023)
Shared: Horror · Walking Simulator · Psychological Horror

OMORI
Shared: Psychological Horror · Story Rich · Horror

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

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

The Exit 8
Shared: Horror · Walking Simulator · Psychological Horror

Firewatch
Shared: Walking Simulator · Story Rich · First-Person

Dollmare
Shared: Horror · Psychological Horror · First-Person

September 7th
Shared: Horror · Walking Simulator · Psychological Horror

35MM
Shared: Walking Simulator · Horror · Psychological Horror

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

While We Wait Here
Shared: Horror · Psychological Horror · Multiple Endings

Killer Frequency
Shared: Horror · Walking Simulator · First-Person

Platform 8
Shared: Psychological Horror · Walking Simulator · Exploration

The Inn-Sanity
Shared: Horror · Psychological Horror · Walking Simulator