Games like Unspoken
Games like Unspoken include Mouthwashing, Poppy Playtime, No, I'm not a Human, Little Nightmares II, and MiSide. We matched them by the tags players give Unspoken on Steam (Horror, Psychological Horror, Atmospheric, Thriller, and Narrative): closest matches first, and among equally close ones the better-known games.

Mouthwashing
Shared: Horror · Psychological Horror · Atmospheric

Poppy Playtime
Shared: Horror · Singleplayer · Psychological Horror

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

Little Nightmares II
Shared: Horror · Atmospheric · Psychological Horror

MiSide
Shared: Psychological Horror · Horror · Atmospheric

Outlast
Shared: Horror · Atmospheric · Psychological Horror

Alan Wake
Shared: Horror · Thriller · Atmospheric

Sally Face - Episode One
Shared: Psychological Horror · Horror · Atmospheric

Little Nightmares
Shared: Horror · Atmospheric · Singleplayer

SOMA
Shared: Horror · Psychological Horror · Atmospheric

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

Firework
Shared: Horror · Psychological Horror · Atmospheric

Outlast 2
Shared: Horror · Psychological Horror · Atmospheric

Layers of Fear (2016)
Shared: Horror · Psychological Horror · Atmospheric

Garten of Banban
Shared: Horror · Psychological Horror · Singleplayer

Darkwood
Shared: Horror · Psychological Horror · Atmospheric

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

Detention
Shared: Horror · Psychological Horror · Atmospheric

Phasmophobia
Shared: Horror · Psychological Horror · Dark

No one lives under the lighthouse Director's cut
Shared: Horror · Atmospheric · Psychological Horror

Resident Evil 7 Biohazard
Shared: Horror · Atmospheric · Singleplayer

Firewatch
Shared: Atmospheric · Adventure · Singleplayer

Still Wakes the Deep
Shared: Horror · Psychological Horror · Atmospheric

Stories Untold
Shared: Horror · Atmospheric · Psychological Horror