Games like Red October
Games like Red October include Firewatch, Road 96, What Remains of Edith Finch, Gone Home, and PEAK. We matched them by the tags players give Red October on Steam (Adventure, Walking Simulator, Choose Your Own Adventure, Exploration, and 3D): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Walking Simulator · First-Person

Road 96
Shared: Adventure · First-Person · Colorful

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

Gone Home
Shared: Walking Simulator · Exploration · First-Person

PEAK
Shared: Adventure · Exploration · First-Person

The Witness
Shared: Exploration · First-Person · Walking Simulator

The Forgotten City
Shared: Adventure · Exploration · First-Person

Riven
Shared: Adventure · Exploration · First-Person

Quern - Undying Thoughts
Shared: Adventure · Walking Simulator · Exploration

POOLS
Shared: Walking Simulator · Exploration · Realistic

Outer Wilds
Shared: Exploration · Adventure · Atmospheric

Bright Lights of Svetlov
Shared: Walking Simulator · Adventure · Exploration

Slime Rancher
Shared: Adventure · Exploration · First-Person

Millennium Dream
Shared: Adventure · Walking Simulator · Exploration

CARIMARA: Beneath the forlorn limbs
Shared: Adventure · Exploration · 3D

The Painscreek Killings
Shared: Exploration · Walking Simulator · Adventure

Scanner Sombre
Shared: Walking Simulator · Exploration · Adventure

The Stanley Parable
Shared: Walking Simulator · First-Person · Adventure

Call of the Sea
Shared: Adventure · First-Person · Exploration

Eastshade
Shared: Adventure · Exploration · First-Person

The Long Dark
Shared: Exploration · Adventure · First-Person

Journey
Shared: Adventure · Exploration · Walking Simulator

INFRA
Shared: Exploration · Walking Simulator · Adventure

Who's at the door?
Shared: Adventure · Walking Simulator · Choose Your Own Adventure