Games like Backrooms: Reminiscence
Games like Backrooms: Reminiscence include Firewatch, What Remains of Edith Finch, Layers of Fear (2016), SOMA, and Still Wakes the Deep. We matched them by the tags players give Backrooms: Reminiscence on Steam (Adventure, Horror, Psychological Horror, Story Rich, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Story Rich · Walking Simulator

What Remains of Edith Finch
Shared: Story Rich · Adventure · Walking Simulator

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

SOMA
Shared: Horror · Psychological Horror · Story Rich

Still Wakes the Deep
Shared: Horror · Psychological Horror · Story Rich

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

Little Nightmares II
Shared: Adventure · Horror · Singleplayer

MiSide
Shared: Psychological Horror · Story Rich · Horror

Blair Witch
Shared: Adventure · Horror · Psychological Horror

Mouthwashing
Shared: Horror · Psychological Horror · Story Rich

Little Nightmares
Shared: Horror · Adventure · Singleplayer

ROUTINE
Shared: Psychological Horror · Singleplayer · Adventure

Visage
Shared: Horror · Psychological Horror · Adventure

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

Outlast
Shared: Horror · Psychological Horror · First-Person

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

SILENT HILL 2
Shared: Horror · Psychological Horror · Story Rich

Sally Face - Episode One
Shared: Psychological Horror · Story Rich · Horror

Poppy Playtime
Shared: Horror · Singleplayer · Psychological Horror

The Beast Inside
Shared: Adventure · Horror · Psychological Horror

Outer Wilds
Shared: Adventure · Story Rich · Exploration

DEATH STRANDING DIRECTOR'S CUT
Shared: Story Rich · Walking Simulator · Adventure

KARMA: The Dark World
Shared: Horror · Psychological Horror · Walking Simulator

The Park®
Shared: Horror · Psychological Horror · Adventure