Games like Scream under the house
Games like Scream under the house include What Remains of Edith Finch, Firewatch, SOMA, Layers of Fear (2016), and Amnesia: A Machine For Pigs. We matched them by the tags players give Scream under the house on Steam (Psychological Horror, Horror, Walking Simulator, First-Person, and Exploration): closest matches first, and among equally close ones the better-known games.

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

Firewatch
Shared: Walking Simulator · Atmospheric · First-Person

SOMA
Shared: Psychological Horror · Horror · Atmospheric

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

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

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

Mouthwashing
Shared: Psychological Horror · Horror · Atmospheric

Outlast
Shared: Horror · First-Person · Psychological Horror

MiSide
Shared: Psychological Horror · Horror · First-Person

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

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

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

Visage
Shared: Psychological Horror · Horror · First-Person

Outer Wilds
Shared: Exploration · Story Rich · Atmospheric

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

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

DON'T SCREAM
Shared: Psychological Horror · Horror · First-Person

The Park®
Shared: Psychological Horror · Horror · Walking Simulator

Scanner Sombre
Shared: Horror · Walking Simulator · Exploration

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

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

Psalm 5:9-13
Shared: Psychological Horror · Horror · Exploration

ROUTINE
Shared: Psychological Horror · Atmospheric · Horror

Escape the Backrooms
Shared: Horror · Psychological Horror · First-Person