Games like SO-3: Caso 044
Games like SO-3: Caso 044 include Firewatch, MiSide, What Remains of Edith Finch, Outer Wilds, and Amnesia: A Machine For Pigs. We matched them by the tags players give SO-3: Caso 044 on Steam (Psychological Horror, Story Rich, Atmospheric, First-Person, and Mystery): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Story Rich · Atmospheric · Adventure

MiSide
Shared: Psychological Horror · Story Rich · First-Person

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

Outer Wilds
Shared: Story Rich · Mystery · Atmospheric

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

Mouthwashing
Shared: Psychological Horror · Story Rich · Atmospheric

SOMA
Shared: Psychological Horror · Atmospheric · Story Rich

Sally Face - Episode One
Shared: Psychological Horror · Story Rich · Atmospheric

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

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

Dagon: by H. P. Lovecraft
Shared: Atmospheric · Story Rich · Psychological Horror

Amanda the Adventurer
Shared: First-Person · Story Rich · Mystery

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

Subliminal
Shared: Psychological Horror · Atmospheric · Mystery

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

CARIMARA: Beneath the forlorn limbs
Shared: Story Rich · Mystery · Adventure

Blue Prince
Shared: Mystery · Story Rich · First-Person

Alan Wake
Shared: Story Rich · Atmospheric · Psychological Horror

Phasmophobia
Shared: Psychological Horror · First-Person · Horror

Outlast
Shared: First-Person · Psychological Horror · Atmospheric

The Bridge Curse 2: The Extrication
Shared: Story Rich · Psychological Horror · Mystery

Detention
Shared: Psychological Horror · Atmospheric · Story Rich

The Painscreek Killings
Shared: Mystery · Story Rich · Investigation

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