Games like Summer Mission
Games like Summer Mission include Firewatch, Outer Wilds, OneShot, Night in the Woods, and What Remains of Edith Finch. We matched them by the tags players give Summer Mission on Steam (Adventure, Retro, Anime, Story Rich, and Atmospheric): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Story Rich · Atmospheric

Outer Wilds
Shared: Adventure · Story Rich · Exploration

OneShot
Shared: Story Rich · Atmospheric · Adventure

Night in the Woods
Shared: Adventure · Story Rich · Atmospheric

What Remains of Edith Finch
Shared: Story Rich · Atmospheric · Adventure

Hollow Knight
Shared: Adventure · Atmospheric · Exploration

The Witcher 3: Wild Hunt — Remastered
Shared: Story Rich · Adventure · Atmospheric

FAR: Lone Sails
Shared: Adventure · Atmospheric · Exploration

Sable
Shared: Adventure · Atmospheric · Story Rich

MiSide
Shared: Story Rich · Anime · Atmospheric

Love, Money, Rock'n'Roll
Shared: Anime · Atmospheric · 1980s

Hollow Knight: Silksong
Shared: Adventure · Indie · Exploration

Beat Cop
Shared: Retro · Adventure · 1980s

GRIS
Shared: Atmospheric · Adventure · Indie

Wuthering Waves
Shared: Anime · Adventure · Story Rich

Papers, Please
Shared: Retro · Story Rich · Indie

Fallout 4
Shared: Adventure · Exploration · Atmospheric

Tomb Raider Game of the Year
Shared: Adventure · Story Rich · Exploration

Road 96
Shared: Adventure · Story Rich · Atmospheric

DEATH STRANDING DIRECTOR'S CUT
Shared: Story Rich · Atmospheric · Adventure

Journey
Shared: Adventure · Atmospheric · Exploration

Brothers - A Tale of Two Sons
Shared: Adventure · Story Rich · Atmospheric

Not For Broadcast
Shared: Adventure · 1980s · Story Rich

SANABI
Shared: Story Rich · Adventure · Retro