Games like Twogether: Project Indigos Chapter 1
Games like Twogether: Project Indigos Chapter 1 include COCOON, Portal, Little Nightmares, Stray, and The Last Campfire. We matched them by the tags players give Twogether: Project Indigos Chapter 1 on Steam (Adventure, Puzzle Platformer, Puzzle, 3D, and Sci-fi): closest matches first, and among equally close ones the better-known games.

COCOON
Shared: Adventure · Puzzle · Puzzle Platformer

Portal
Shared: Puzzle Platformer · Puzzle · Sci-fi

Little Nightmares
Shared: Adventure · Puzzle Platformer · Singleplayer

Stray
Shared: Adventure · Singleplayer · Atmospheric

The Last Campfire
Shared: Adventure · Puzzle · Singleplayer

Portal 2
Shared: Puzzle · Singleplayer · Puzzle Platformer

GRIS
Shared: Adventure · Atmospheric · Singleplayer

Monument Valley
Shared: Adventure · Puzzle · Singleplayer

LIMBO
Shared: Puzzle Platformer · Puzzle · Adventure

Little Nightmares II
Shared: Adventure · Puzzle · Singleplayer

Planet of Lana
Shared: Puzzle Platformer · Puzzle · Adventure

Tomb Raider Game of the Year
Shared: Adventure · Singleplayer · Female Protagonist

Rise of the Tomb Raider™
Shared: Adventure · Singleplayer · Female Protagonist

The Swapper
Shared: Puzzle · Puzzle Platformer · Sci-fi

Chants of Sennaar
Shared: Adventure · Puzzle · Singleplayer

INSIDE
Shared: Puzzle Platformer · Atmospheric · Adventure

Seen
Shared: Adventure · Puzzle · Singleplayer

FAR: Lone Sails
Shared: Adventure · Atmospheric · Singleplayer

The Turing Test
Shared: Puzzle · Sci-fi · Adventure

Viewfinder
Shared: Puzzle Platformer · Puzzle · Adventure

The Room Three
Shared: Adventure · Puzzle · Singleplayer

Contrast
Shared: Adventure · Puzzle · Female Protagonist

Dungeons of Hinterberg
Shared: Puzzle · Adventure · Singleplayer

Timelie
Shared: Puzzle Platformer · Puzzle · Singleplayer