Games like Colony
Games like Colony include Poppy Playtime, MiSide, Resident Evil Village, METRO 2033 Redux, and Outlast. We matched them by the tags players give Colony on Steam (First-Person, Action, Horror, Lore-Rich, and Psychological Horror): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · First-Person · Singleplayer

MiSide
Shared: Psychological Horror · First-Person · Horror

Resident Evil Village
Shared: First-Person · Horror · Action

METRO 2033 Redux
Shared: Horror · Action · First-Person

Outlast
Shared: First-Person · Horror · Psychological Horror

Five Nights at Freddy's: Security Breach
Shared: Horror · First-Person · Singleplayer

Bendy and the Dark Revival
Shared: First-Person · Horror · Action

Metro Exodus
Shared: Action · First-Person · Story Rich

METRO Last Light Redux
Shared: Action · Horror · First-Person

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

Resident Evil 7 Biohazard
Shared: First-Person · Horror · Action

The Beast Inside
Shared: First-Person · Horror · Action

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

Little Nightmares II
Shared: Horror · Psychological Horror · Singleplayer

In Sound Mind
Shared: Horror · Action · Psychological Horror

Half-Life: Alyx
Shared: Horror · Story Rich · First-Person

Buckshot Roulette
Shared: First-Person · Horror · Singleplayer

Half-Life 2
Shared: Action · First-Person · Story Rich

Bendy and the Ink Machine
Shared: First-Person · Horror · Singleplayer

Dishonored
Shared: First-Person · Action · Stealth

Dark Deception
Shared: Horror · First-Person · Psychological Horror

Penumbra: Black Plague Gold Edition
Shared: First-Person · Horror · Psychological Horror

Resident Evil Requiem
Shared: Horror · Action · First-Person

Amnesia: Rebirth
Shared: First-Person · Horror · Story Rich