Games like White Lilies Code
Games like White Lilies Code include Fallout 4, Fallout: New Vegas, Outer Wilds, STEINS;GATE 0, and FAR: Lone Sails. We matched them by the tags players give White Lilies Code on Steam (Visual Novel, Adventure, Sci-fi, Singleplayer, and Artificial Intelligence): closest matches first, and among equally close ones the better-known games.

Fallout 4
Shared: Singleplayer · Adventure · Post-apocalyptic

Fallout: New Vegas
Shared: Singleplayer · Post-apocalyptic · Adventure

Outer Wilds
Shared: Adventure · Story Rich · Exploration

STEINS;GATE 0
Shared: Visual Novel · Sci-fi · Adventure

FAR: Lone Sails
Shared: Adventure · Singleplayer · Post-apocalyptic

STEINS;GATE
Shared: Visual Novel · Sci-fi · Story Rich

The Silent Age
Shared: Adventure · Side Scroller · Sci-fi

Mirror 2: Project X
Shared: Visual Novel · 3D · Singleplayer

OPUS: Echo of Starsong - Full Bloom Edition
Shared: Visual Novel · Story Rich · Singleplayer

Five Nights at Freddy's: Security Breach
Shared: Singleplayer · Adventure · 3D

The Talos Principle
Shared: Sci-fi · Singleplayer · Story Rich

DEATH STRANDING DIRECTOR'S CUT
Shared: Story Rich · Adventure · Post-apocalyptic

STAR WARS Jedi: Survivor™
Shared: Singleplayer · Adventure · Sci-fi

Firewatch
Shared: Adventure · Singleplayer · Story Rich

STAR WARS™ Knights of the Old Republic™
Shared: Sci-fi · Singleplayer · Adventure

Clair Obscur: Expedition 33
Shared: Singleplayer · Story Rich · Adventure

eden*
Shared: Visual Novel · Adventure · Singleplayer

Fallout 3
Shared: Singleplayer · Post-apocalyptic · Sci-fi

Hollow Knight: Silksong
Shared: Singleplayer · Indie · Adventure

Starfield
Shared: Singleplayer · Sci-fi · Adventure

Hollow Knight
Shared: Singleplayer · Adventure · Indie

Half-Life 2
Shared: Sci-fi · Singleplayer · Adventure

Metro Exodus
Shared: Singleplayer · Post-apocalyptic · Story Rich

Deliver Us The Moon
Shared: Adventure · Sci-fi · Singleplayer