Games like Mumble Pines: The Arrival
Games like Mumble Pines: The Arrival include Escape the Backrooms, Five Nights at Freddy's: Secret of the Mimic, SILENT HILL: Townfall, Outlast, and Five Nights at Freddy's: Security Breach. We matched them by the tags players give Mumble Pines: The Arrival on Steam (Exploration, Action, Action-Adventure, 3D, and Adventure): closest matches first, and among equally close ones the better-known games.

Escape the Backrooms
Shared: Horror · Exploration · Psychological Horror

Five Nights at Freddy's: Secret of the Mimic
Shared: Action · Adventure · First-Person

SILENT HILL: Townfall
Shared: Action · Adventure · Exploration

Outlast
Shared: First-Person · Horror · Psychological Horror

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

Lethal Company
Shared: Exploration · First-Person · Horror

Resident Evil Requiem
Shared: Action · Horror · Action-Adventure

A Plague Tale: Requiem
Shared: Action · Action-Adventure · Exploration

The Forest
Shared: Horror · Adventure · Action

SOMA
Shared: Horror · Exploration · Psychological Horror

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

The Beast Inside
Shared: Adventure · Action · Horror

Backrooms: Escape Together
Shared: Horror · Psychological Horror · Exploration

Outlast 2
Shared: Horror · First-Person · Psychological Horror

PEAK
Shared: Exploration · Adventure · First-Person

Total Chaos
Shared: Action · Exploration · Adventure

Darkwood
Shared: Action · Adventure · Horror

Amnesia: Rebirth
Shared: Action-Adventure · First-Person · Exploration

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

Amnesia: The Dark Descent
Shared: Horror · Psychological Horror · First-Person

Ready or Not
Shared: Realistic · Action · Horror

SILENT HILL f
Shared: Action · Horror · Psychological Horror

Zort
Shared: Horror · Action · First-Person

Hamster Hunter
Shared: Exploration · Action-Adventure · 3D