Games like No Customers Left
Games like No Customers Left include Firewatch, Little Nightmares II, MiSide, Five Nights at Freddy's: Security Breach, and Little Nightmares. We matched them by the tags players give No Customers Left on Steam (Adventure, Singleplayer, Thriller, Horror, and Casual): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Singleplayer · Story Rich

Little Nightmares II
Shared: Adventure · Singleplayer · Horror

MiSide
Shared: Horror · Singleplayer · Story Rich

Five Nights at Freddy's: Security Breach
Shared: Singleplayer · Horror · Adventure

Little Nightmares
Shared: Adventure · Horror · Singleplayer

Mouthwashing
Shared: Horror · Story Rich · Retro

Poppy Playtime
Shared: Singleplayer · Horror · Adventure

Alan Wake
Shared: Horror · Adventure · Thriller

No, I'm not a Human
Shared: Horror · Singleplayer · Story Rich

Bendy and the Dark Revival
Shared: Singleplayer · Horror · Adventure

INSIDE
Shared: Horror · Singleplayer · Adventure

Stories Untold
Shared: Adventure · Horror · Singleplayer

Hellblade: Senua's Sacrifice
Shared: Singleplayer · Adventure · Atmospheric

The Last of Us™ Part I
Shared: Horror · Singleplayer · Story Rich

Amnesia: Rebirth
Shared: Singleplayer · Adventure · Horror

Metro Exodus
Shared: Singleplayer · Horror · Story Rich

Layers of Fear (2016)
Shared: Horror · Singleplayer · Adventure

What Remains of Edith Finch
Shared: Adventure · Story Rich · Singleplayer

The Room
Shared: Singleplayer · Adventure · Atmospheric

A Story About My Uncle
Shared: Adventure · Singleplayer · Atmospheric

Five Nights at Freddy's: Secret of the Mimic
Shared: Adventure · Horror · Singleplayer

Fears to Fathom - Norwood Hitchhike
Shared: Horror · Thriller · Retro

Outlast
Shared: Horror · Singleplayer · Atmospheric

A Plague Tale: Innocence
Shared: Adventure · Singleplayer · Story Rich