Games like Eternal Afternoon
Games like Eternal Afternoon include Firewatch, What Remains of Edith Finch, Gone Home, A Short Hike, and Eclipsium. We matched them by the tags players give Eternal Afternoon on Steam (Walking Simulator, Exploration, Short, Nostalgia, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Walking Simulator · Exploration · Adventure

What Remains of Edith Finch
Shared: Walking Simulator · Exploration · Story Rich

Gone Home
Shared: Walking Simulator · Short · Exploration

A Short Hike
Shared: Exploration · Pixel Graphics · Short

Eclipsium
Shared: Walking Simulator · Surreal · Pixel Graphics

The Beginner's Guide
Shared: Walking Simulator · Short · Story Rich

Mouthwashing
Shared: Psychological Horror · Walking Simulator · Retro

DEATH STRANDING DIRECTOR'S CUT
Shared: Walking Simulator · Exploration · Open World

Outer Wilds
Shared: Exploration · Adventure · Story Rich

Jazzpunk: Director's Cut
Shared: Exploration · Short · Surreal

DREDGE
Shared: Exploration · Open World · Adventure

Amnesia: A Machine For Pigs
Shared: Walking Simulator · Exploration · Psychological Horror

OneShot
Shared: Pixel Graphics · Story Rich · Exploration

A Bird Story
Shared: Short · Pixel Graphics · Story Rich

Cairn
Shared: Exploration · Walking Simulator · Adventure

POOLS
Shared: Walking Simulator · Exploration · Psychological Horror

OMORI
Shared: Pixel Graphics · Psychological Horror · Story Rich

Endacopia
Shared: Exploration · Psychological Horror · Pixel Graphics

To the Moon
Shared: Pixel Graphics · Short · Story Rich

The Stanley Parable
Shared: Walking Simulator · Exploration · Indie

The Park®
Shared: Walking Simulator · Exploration · Psychological Horror

The Exit 8
Shared: Exploration · Walking Simulator · Psychological Horror

The Witness
Shared: Exploration · Walking Simulator · Open World

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