Games like Dream So Long
Games like Dream So Long include The Exit 8, What Remains of Edith Finch, The Witness, Layers of Fear (2016), and Scanner Sombre. We matched them by the tags players give Dream So Long on Steam (Walking Simulator, Puzzle, Exploration, First-Person, and Psychological Horror): closest matches first, and among equally close ones the better-known games.

The Exit 8
Shared: Puzzle · Walking Simulator · Exploration

What Remains of Edith Finch
Shared: Walking Simulator · First-Person · Exploration

The Witness
Shared: Puzzle · Exploration · First-Person

Layers of Fear (2016)
Shared: Walking Simulator · Psychological Horror · First-Person

Scanner Sombre
Shared: Walking Simulator · Exploration · First-Person

Platform 8
Shared: Walking Simulator · Psychological Horror · Puzzle

INFRA
Shared: Puzzle · Exploration · Walking Simulator

Poppy Playtime
Shared: Puzzle · Singleplayer · First-Person

Superliminal
Shared: Puzzle · First-Person · Singleplayer

POOLS
Shared: Walking Simulator · Psychological Horror · Exploration

Dear Esther: Landmark Edition
Shared: Walking Simulator · Exploration · Puzzle

Garten of Banban
Shared: First-Person · Puzzle · Singleplayer

SOMA
Shared: Psychological Horror · Exploration · First-Person

Firewatch
Shared: Walking Simulator · First-Person · Exploration

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

Amnesia: A Machine For Pigs
Shared: Walking Simulator · First-Person · Exploration

ROUTINE
Shared: Psychological Horror · Singleplayer · Puzzle

Portal 2
Shared: Puzzle · Singleplayer · First-Person

Slime Rancher
Shared: Exploration · First-Person · Singleplayer

September 7th
Shared: Walking Simulator · Exploration · First-Person

Blue Prince
Shared: Puzzle · Exploration · Singleplayer

Killer Frequency
Shared: Puzzle · Walking Simulator · First-Person

The Talos Principle
Shared: Puzzle · First-Person · Singleplayer

Antichamber
Shared: Puzzle · First-Person · Exploration