Games like Kukui 2
Games like Kukui 2 include SOMA, What Remains of Edith Finch, MiSide, Inside the Backrooms, and Amnesia: A Machine For Pigs. We matched them by the tags players give Kukui 2 on Steam (Story Rich, Psychological Horror, Survival Horror, Atmospheric, and First-Person): closest matches first, and among equally close ones the better-known games.

SOMA
Shared: Psychological Horror · Story Rich · Atmospheric

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

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

Inside the Backrooms
Shared: Survival Horror · Psychological Horror · Puzzle

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

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

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

Firewatch
Shared: Story Rich · Atmospheric · First-Person

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

Amnesia: The Dark Descent
Shared: Psychological Horror · Survival Horror · Atmospheric

Resident Evil 7 Biohazard
Shared: Survival Horror · First-Person · Atmospheric

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

Outer Wilds
Shared: Story Rich · Exploration · Atmospheric

Backrooms: Escape Together
Shared: Psychological Horror · Survival Horror · Atmospheric

Mouthwashing
Shared: Psychological Horror · Story Rich · Atmospheric

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

INFRA
Shared: Atmospheric · Exploration · First-Person

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

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

Darkwood
Shared: Survival Horror · Psychological Horror · Atmospheric

OMORI
Shared: Story Rich · Psychological Horror · RPG

Hello Neighbor
Shared: Story Rich · First-Person · Survival Horror

Visage
Shared: Psychological Horror · Survival Horror · First-Person

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