Games like The Nameless City
Games like The Nameless City include Mouthwashing, SOMA, Layers of Fear (2016), Still Wakes the Deep, and What Remains of Edith Finch. We matched them by the tags players give The Nameless City on Steam (Lovecraftian, Psychological Horror, Walking Simulator, Atmospheric, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Mouthwashing
Shared: Psychological Horror · Atmospheric · Walking Simulator

SOMA
Shared: Psychological Horror · Atmospheric · Dark

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

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

What Remains of Edith Finch
Shared: Walking Simulator · Atmospheric · Singleplayer

Amnesia: The Dark Descent
Shared: Psychological Horror · Atmospheric · Puzzle

Little Nightmares II
Shared: Singleplayer · Psychological Horror · Atmospheric

Poppy Playtime
Shared: Singleplayer · Puzzle · Psychological Horror

Scorn
Shared: Atmospheric · Puzzle · Psychological Horror

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

Little Nightmares
Shared: Atmospheric · Singleplayer · Puzzle

Layers of Fear 2 (2019)
Shared: Psychological Horror · Atmospheric · Walking Simulator

Garten of Banban
Shared: Psychological Horror · Singleplayer · Puzzle

ROUTINE
Shared: Psychological Horror · Singleplayer · Atmospheric

Fran Bow
Shared: Psychological Horror · Puzzle · Singleplayer

The Room Two
Shared: Puzzle · Atmospheric · Lovecraftian

Firewatch
Shared: Atmospheric · Walking Simulator · Singleplayer

Outlast
Shared: Psychological Horror · Atmospheric · Singleplayer

The Exit 8
Shared: Walking Simulator · Psychological Horror · Puzzle

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

POOLS
Shared: Psychological Horror · Walking Simulator · Atmospheric

Visage
Shared: Psychological Horror · Singleplayer · Atmospheric

The Room Three
Shared: Puzzle · Atmospheric · Lovecraftian

Garten of Banban 2
Shared: Psychological Horror · Singleplayer · Puzzle