Games like Little Brother Jim
Games like Little Brother Jim include Firewatch, What Remains of Edith Finch, Outer Wilds, Journey, and Slime Rancher. We matched them by the tags players give Little Brother Jim on Steam (Adventure, Casual, Exploration, First-Person, and Atmospheric): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Atmospheric · First-Person

What Remains of Edith Finch
Shared: Atmospheric · Adventure · First-Person

Outer Wilds
Shared: Exploration · Adventure · Mystery

Journey
Shared: Adventure · Atmospheric · Exploration

Slime Rancher
Shared: Adventure · Exploration · First-Person

Riven
Shared: Adventure · Exploration · First-Person

The Witness
Shared: Exploration · First-Person · Atmospheric

Road 96
Shared: First-Person · Adventure · Atmospheric

Fallout 4
Shared: Exploration · Adventure · Singleplayer

CARIMARA: Beneath the forlorn limbs
Shared: Adventure · Exploration · Mystery

Gone Home
Shared: Exploration · Atmospheric · First-Person

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

The Long Dark
Shared: Exploration · Adventure · Atmospheric

Blue Prince
Shared: Exploration · Mystery · First-Person

The Forgotten City
Shared: Adventure · Exploration · Mystery

ABZU
Shared: Exploration · Atmospheric · Adventure

The Beginner's Guide
Shared: First-Person · Atmospheric · Adventure

Quern - Undying Thoughts
Shared: Adventure · Exploration · Atmospheric

RV There Yet?
Shared: Adventure · First-Person · Exploration

The Room
Shared: Adventure · Mystery · Atmospheric

The Vanishing of Ethan Carter
Shared: Atmospheric · Mystery · Exploration

Stray
Shared: Adventure · Atmospheric · Exploration

INFRA
Shared: Exploration · Adventure · First-Person

FAR: Lone Sails
Shared: Adventure · Atmospheric · Exploration