Games like Scare Girl
Games like Scare Girl include Firewatch, Blair Witch, Little Nightmares II, Layers of Fear (2016), and The Beast Inside. We matched them by the tags players give Scare Girl on Steam (Adventure, Walking Simulator, Horror, Singleplayer, and Violent): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Walking Simulator · Singleplayer

Blair Witch
Shared: Adventure · Horror · Violent

Little Nightmares II
Shared: Adventure · Horror · Singleplayer

Layers of Fear (2016)
Shared: Horror · Walking Simulator · Singleplayer

The Beast Inside
Shared: Adventure · Horror · Singleplayer

VERGE:Lost chapter
Shared: Walking Simulator · Horror · Adventure

Little Nightmares
Shared: Adventure · Horror · Singleplayer

The Medium
Shared: Adventure · Horror · Singleplayer

Hellblade: Senua's Sacrifice
Shared: Adventure · Singleplayer · Horror

Visage
Shared: Horror · Adventure · Singleplayer

Resident Evil 7 Biohazard
Shared: Horror · Singleplayer · Violent

Poppy Playtime
Shared: Horror · Singleplayer · Adventure

A Plague Tale: Innocence
Shared: Adventure · Singleplayer · Horror

The Forest
Shared: Horror · Adventure · Singleplayer

What Remains of Edith Finch
Shared: Walking Simulator · Adventure · Singleplayer

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

Stray
Shared: Adventure · Singleplayer · Horror

Granny
Shared: Horror · Singleplayer · Adventure

DEATH STRANDING DIRECTOR'S CUT
Shared: Walking Simulator · Adventure · Singleplayer

Ready or Not
Shared: Singleplayer · Horror · Adventure

Outlast 2
Shared: Horror · Singleplayer · Violent

Outlast
Shared: Horror · Singleplayer · Adventure

Amnesia: A Machine For Pigs
Shared: Walking Simulator · Horror · Adventure

The Park®
Shared: Horror · Walking Simulator · Adventure