Games like [REC] Paroxysm
Games like [REC] Paroxysm include No, I'm not a Human, Mouthwashing, MiSide, Poppy Playtime, and SOMA. We matched them by the tags players give [REC] Paroxysm on Steam (Psychological Horror, Indie, Horror, Thriller, and Realistic): closest matches first, and among equally close ones the better-known games.

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

Mouthwashing
Shared: Psychological Horror · Horror · Indie

MiSide
Shared: Psychological Horror · Horror · Story Rich

Poppy Playtime
Shared: Horror · Singleplayer · Psychological Horror

SOMA
Shared: Psychological Horror · Horror · Atmospheric

Outlast
Shared: Horror · Psychological Horror · Atmospheric

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

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

Little Nightmares II
Shared: Horror · Psychological Horror · Singleplayer

Outlast 2
Shared: Psychological Horror · Horror · Singleplayer

Five Nights at Freddy's
Shared: Horror · Psychological Horror · Indie

Little Nightmares
Shared: Horror · Atmospheric · Indie

Visage
Shared: Psychological Horror · Horror · Dark

Five Nights at Freddy's 2
Shared: Horror · Psychological Horror · Singleplayer

Firework
Shared: Indie · Horror · Psychological Horror

Subliminal
Shared: Psychological Horror · Realistic · Thriller

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

Detention
Shared: Indie · Psychological Horror · Horror

Fran Bow
Shared: Psychological Horror · Horror · Indie

Ready or Not
Shared: Realistic · Horror · Psychological Horror

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

Phasmophobia
Shared: Horror · Psychological Horror · First-Person

Garten of Banban
Shared: Horror · Psychological Horror · Singleplayer

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