Games like Killer Island
Games like Killer Island include Lethal Company, Among Us, Escape the Backrooms, MIMESIS, and Dying Light. We matched them by the tags players give Killer Island on Steam (Social Deduction, Survival Horror, Online Co-Op, Exploration, and Survival): closest matches first, and among equally close ones the better-known games.

Lethal Company
Shared: Online Co-Op · Survival Horror · Exploration

Among Us
Shared: Social Deduction · Online Co-Op · Survival

Escape the Backrooms
Shared: Online Co-Op · Survival Horror · Psychological Horror

MIMESIS
Shared: Social Deduction · Online Co-Op · Psychological Horror

Dying Light
Shared: Survival Horror · Online Co-Op · Survival

The Forest
Shared: Survival · Survival Horror · Exploration

Sons Of The Forest
Shared: Survival · Survival Horror · Exploration

Pacify
Shared: Online Co-Op · Survival Horror · Psychological Horror

Dead by Daylight
Shared: Survival Horror · Online Co-Op · Survival

Nuclear Nightmare
Shared: Survival Horror · Online Co-Op · Psychological Horror

Darkwood
Shared: Survival Horror · Psychological Horror · Survival

Don't Starve Together
Shared: Survival · Online Co-Op · Survival Horror

Green Hell
Shared: Survival · Online Co-Op · Exploration

Content Warning
Shared: Online Co-Op · Exploration · Survival Horror

Subnautica 2
Shared: Survival · Exploration · Survival Horror

Backrooms: Escape Together
Shared: Online Co-Op · Survival Horror · Psychological Horror

Valheim
Shared: Online Co-Op · Survival · Exploration

DEVOUR
Shared: Online Co-Op · Survival Horror · Psychological Horror

Inside the Backrooms
Shared: Survival Horror · Online Co-Op · Psychological Horror

MISERY
Shared: Online Co-Op · Survival · Survival Horror

In Silence
Shared: Online Co-Op · Survival Horror · Psychological Horror

7 Days to Die
Shared: Survival · Online Co-Op · Exploration

Outlast
Shared: Survival Horror · Psychological Horror · Survival

DayZ
Shared: Survival · Online Co-Op · Survival Horror