Games like Hotel Mélancolie
Games like Hotel Mélancolie include Mouthwashing, Outlast, MiSide, Layers of Fear (2016), and Firewatch. We matched them by the tags players give Hotel Mélancolie on Steam (Psychological Horror, Retro, Horror, Atmospheric, and Supernatural): closest matches first, and among equally close ones the better-known games.

Mouthwashing
Shared: Psychological Horror · Horror · Retro

Outlast
Shared: Horror · Psychological Horror · Atmospheric

MiSide
Shared: Psychological Horror · Horror · First-Person

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

Firewatch
Shared: Atmospheric · First-Person · Walking Simulator

SOMA
Shared: Psychological Horror · Horror · Atmospheric

What Remains of Edith Finch
Shared: Atmospheric · First-Person · Exploration

Firework
Shared: Horror · Psychological Horror · Atmospheric

Poppy Playtime
Shared: Horror · Psychological Horror · First-Person

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

Phasmophobia
Shared: Horror · Psychological Horror · Supernatural

Lethal Company
Shared: Horror · First-Person · Psychological Horror

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

Still Wakes the Deep
Shared: Psychological Horror · Horror · First-Person

Escape the Backrooms
Shared: Horror · Psychological Horror · First-Person

Garten of Banban
Shared: Horror · Psychological Horror · First-Person

Outlast 2
Shared: Psychological Horror · Horror · First-Person

The Park®
Shared: Psychological Horror · Horror · Atmospheric

POOLS
Shared: Psychological Horror · Atmospheric · First-Person

Resident Evil 7 Biohazard
Shared: Horror · First-Person · Psychological Horror

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

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

Psalm 5:9-13
Shared: Psychological Horror · Horror · Atmospheric

Scanner Sombre
Shared: Horror · Atmospheric · Psychological Horror