Games like Sanguine Sanctum
Games like Sanguine Sanctum include Amnesia: The Dark Descent, Mouthwashing, SOMA, CARRION, and Lethal Company. We matched them by the tags players give Sanguine Sanctum on Steam (Indie, Gore, Horror, and Exploration): closest matches first, and among equally close ones the better-known games.

Amnesia: The Dark Descent
Shared: Gore · Horror · Indie

Mouthwashing
Shared: Horror · Indie · Gore

SOMA
Shared: Horror · Gore · Exploration

CARRION
Shared: Gore · Indie · Horror

Lethal Company
Shared: Horror · Exploration · Indie

Still Wakes the Deep
Shared: Horror · Gore · Indie

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

Dead by Daylight
Shared: Horror · Gore

Don't Play This
Shared: Indie · Horror · Gore

Outlast
Shared: Horror · Gore · Indie

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

Content Warning
Shared: Horror · Exploration · Indie

Granny: Chapter Two
Shared: Indie · Horror · Gore

Buckshot Roulette
Shared: Horror · Indie · Gore

Crow Country
Shared: Horror · Exploration · Indie

Psalm 2
Shared: Indie · Horror · Gore

Lucius
Shared: Horror · Gore · Indie

The Forest
Shared: Horror · Exploration · Gore

Detention
Shared: Indie · Horror · Gore

[Chillas Art] Aka Manto
Shared: Indie · Horror · Gore

The Count Lucanor
Shared: Horror · Gore · Exploration

Unforgiving - A Northern Hymn
Shared: Indie · Horror · Gore

FAITH: The Unholy Trinity
Shared: Horror · Indie · Gore

Escape the Backrooms
Shared: Horror · Exploration · Indie