Games like Condition Unknown
Games like Condition Unknown include No, I'm not a Human, The Test, The Casting of Frank Stone™, Sally Face - Episode One, and Death and Taxes. We matched them by the tags players give Condition Unknown on Steam (Psychological Horror, Interactive Fiction, Choices Matter, Text-Based, and Multiple Endings): closest matches first, and among equally close ones the better-known games.

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

The Test
Shared: Psychological Horror · Multiple Endings · Choose Your Own Adventure

The Casting of Frank Stone™
Shared: Choices Matter · Multiple Endings · Horror

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

Death and Taxes
Shared: Choices Matter · Psychological Horror · Story Rich

Scarlet Hollow
Shared: Choices Matter · Psychological Horror · Horror

The Test: Hypothesis Rising
Shared: Choices Matter · Multiple Endings · Psychological Horror

Slay the Princess — The Pristine Cut
Shared: Psychological Horror · Choices Matter · Horror

Mouthwashing
Shared: Psychological Horror · Horror · Story Rich

Tiny Bunny
Shared: Psychological Horror · Horror · Choices Matter

Until Dawn™
Shared: Choices Matter · Multiple Endings · Horror

While We Wait Here
Shared: Psychological Horror · Multiple Endings · Horror

Oxenfree
Shared: Choices Matter · Story Rich · Mystery

Late Shift
Shared: Choices Matter · Interactive Fiction · Multiple Endings

Little Misfortune
Shared: Psychological Horror · Choices Matter · Story Rich

OMORI
Shared: Psychological Horror · Story Rich · Multiple Endings

SILENT HILL 2
Shared: Psychological Horror · Horror · Story Rich

Suzerain
Shared: Choices Matter · Interactive Fiction · Text-Based

Breakout 13
Shared: Interactive Fiction · Choices Matter · Choose Your Own Adventure

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

Milk inside a bag of milk inside a bag of milk
Shared: Psychological Horror · Horror · Interactive Fiction

SOMA
Shared: Psychological Horror · Horror · Story Rich

The Dark Pictures Anthology: House of Ashes
Shared: Choices Matter · Psychological Horror · Multiple Endings

Firework
Shared: Psychological Horror · Horror · Mystery