Games like Unwelcome Guest
Games like Unwelcome Guest include Phasmophobia, Poppy Playtime, Sally Face - Episode One, Ghost Exorcism INC., and Pacify. We matched them by the tags players give Unwelcome Guest on Steam (Horror, Supernatural, Thriller, Psychological Horror, and Dark): closest matches first, and among equally close ones the better-known games.

Phasmophobia
Shared: Horror · Psychological Horror · Supernatural

Poppy Playtime
Shared: Horror · Dark · Psychological Horror

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

Ghost Exorcism INC.
Shared: Horror · Supernatural · Psychological Horror

Pacify
Shared: Horror · Psychological Horror · Supernatural

Demonologist
Shared: Horror · Psychological Horror · Dark

Firework
Shared: Horror · Psychological Horror · Mystery

Dread Flats
Shared: Horror · Supernatural · Psychological Horror

SOMA
Shared: Horror · Psychological Horror · Dark

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

The Painscreek Killings
Shared: Mystery · Horror · Investigation

Mouthwashing
Shared: Horror · Psychological Horror · Dark

The Mortuary Assistant
Shared: Horror · Supernatural · Mystery

Outlast
Shared: Horror · Psychological Horror · Dark

Alan Wake
Shared: Horror · Thriller · Psychological Horror

The Room Two
Shared: Horror · Mystery · Adventure

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

Little Nightmares II
Shared: Horror · Dark · Psychological Horror

DON'T SCREAM
Shared: Horror · Psychological Horror · Mystery

Inside the Backrooms
Shared: Horror · Psychological Horror · Adventure

Supernormal
Shared: Horror · Supernatural · Psychological Horror

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

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

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