Games like Mortal Advocate
Games like Mortal Advocate include SOMA, Amnesia: A Machine For Pigs, Tiny Bunny, What Remains of Edith Finch, and Dagon: by H. P. Lovecraft. We matched them by the tags players give Mortal Advocate on Steam (Exploration, Interactive Fiction, Visual Novel, Walking Simulator, and 3D): closest matches first, and among equally close ones the better-known games.

SOMA
Shared: Exploration · Horror · Psychological Horror

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

Tiny Bunny
Shared: Visual Novel · Horror · Dark

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

Dagon: by H. P. Lovecraft
Shared: Visual Novel · Horror · Interactive Fiction

Mouthwashing
Shared: Horror · Psychological Horror · Walking Simulator

Slay the Princess — The Pristine Cut
Shared: Visual Novel · Psychological Horror · Horror

Bad Parenting 1: Mr. Red Face
Shared: Walking Simulator · Exploration · Horror

CARIMARA: Beneath the forlorn limbs
Shared: Exploration · 3D · Horror

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

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

Milk inside a bag of milk inside a bag of milk
Shared: Visual Novel · Interactive Fiction · Horror

Road 96: Mile 0
Shared: Exploration · Interactive Fiction · Visual Novel

Scanner Sombre
Shared: Exploration · Walking Simulator · Horror

The House in Fata Morgana
Shared: Visual Novel · Dark · Psychological Horror

The Exit 8
Shared: Exploration · Walking Simulator · Horror

The Hungry Lamb: Traveling in the Late Ming Dynasty
Shared: Visual Novel · Interactive Fiction · Dark

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

Firewatch
Shared: Walking Simulator · Exploration · Story Rich

Psalm 5:9-13
Shared: Exploration · Walking Simulator · Horror

Dear Esther: Landmark Edition
Shared: Exploration · Interactive Fiction · Walking Simulator

Fears to Fathom - Norwood Hitchhike
Shared: Horror · Exploration · Psychological Horror

Gone Home
Shared: Exploration · Walking Simulator · Atmospheric

Who's Lila?
Shared: Interactive Fiction · Exploration · Horror