Games like The Dark Legacy
Games like The Dark Legacy include MiSide, Little Nightmares II, Mouthwashing, SOMA, and No, I'm not a Human. We matched them by the tags players give The Dark Legacy on Steam (Horror, Psychological Horror, Story Rich, Thriller, and Atmospheric): closest matches first, and among equally close ones the better-known games.

MiSide
Shared: Psychological Horror · Story Rich · Horror

Little Nightmares II
Shared: Horror · Singleplayer · Psychological Horror

Mouthwashing
Shared: Horror · Psychological Horror · Story Rich

SOMA
Shared: Horror · Psychological Horror · Story Rich

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

Little Nightmares
Shared: Horror · Atmospheric · Singleplayer

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

Alan Wake
Shared: Horror · Story Rich · Thriller

Outlast
Shared: Horror · Psychological Horror · Atmospheric

Poppy Playtime
Shared: Horror · Singleplayer · Psychological Horror

Outlast 2
Shared: Horror · Psychological Horror · Singleplayer

Fran Bow
Shared: Psychological Horror · Story Rich · Horror

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

Tiny Bunny
Shared: Horror · Story Rich · Psychological Horror

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

Detention
Shared: Horror · Psychological Horror · Atmospheric

Ready or Not
Shared: Realistic · Horror · Singleplayer

Hellblade: Senua's Sacrifice
Shared: Atmospheric · Story Rich · Horror

Darkwood
Shared: Horror · Psychological Horror · Atmospheric

Subliminal
Shared: Psychological Horror · Horror · Realistic

Resident Evil Village
Shared: Horror · Singleplayer · Story Rich

Still Wakes the Deep
Shared: Horror · Psychological Horror · Story Rich

Metro Exodus
Shared: Story Rich · Singleplayer · Horror

INSIDE
Shared: Horror · Atmospheric · Story Rich