Games like Pay at the pump
Games like Pay at the pump include Mouthwashing, No, I'm not a Human, Summer of '58, Visage, and SOMA. We matched them by the tags players give Pay at the pump on Steam (Horror, Psychological Horror, Dark, Psychological, and Realistic): closest matches first, and among equally close ones the better-known games.

Mouthwashing
Shared: Horror · Psychological Horror · Story Rich

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

Summer of '58
Shared: Horror · Psychological Horror · Psychological

Visage
Shared: Horror · Psychological Horror · Dark

SOMA
Shared: Horror · Psychological Horror · Dark

Outlast 2
Shared: Horror · Psychological Horror · Dark

Fran Bow
Shared: Psychological Horror · Horror · Story Rich

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

Phasmophobia
Shared: Horror · Psychological Horror · Dark

Poppy Playtime
Shared: Horror · Dark · Psychological Horror

Blair Witch
Shared: Horror · Psychological Horror · Dark

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

Layers of Fear (2016)
Shared: Horror · Psychological Horror · Story Rich

God's Basement
Shared: Horror · Psychological Horror · Dark

SILENT HILL 2
Shared: Horror · Psychological Horror · Psychological

Hellblade: Senua's Sacrifice
Shared: Psychological · Dark · Horror

MiSide
Shared: Psychological Horror · Horror · Story Rich

Little Nightmares II
Shared: Horror · Dark · Psychological Horror

Buckshot Roulette
Shared: Dark · Horror · Psychological

The Medium
Shared: Horror · Psychological Horror · Dark

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

Notch - The Innocent LunA: Eclipsed SinnerS
Shared: Horror · Surreal · Psychological Horror

Superliminal
Shared: Psychological · Surreal · Psychological Horror

Tiny Bunny
Shared: Horror · Dark · Psychological Horror