Games like Degeons Project
Games like Degeons Project include Portal 2, Portal, LIMBO, A Story About My Uncle, and Little Nightmares. We matched them by the tags players give Degeons Project on Steam (Adventure, Puzzle, Platformer, 3D Platformer, and Puzzle Platformer): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Puzzle · Platformer · First-Person

Portal
Shared: Puzzle · Puzzle Platformer · 3D Platformer

LIMBO
Shared: Puzzle · Puzzle Platformer · Platformer

A Story About My Uncle
Shared: Adventure · First-Person · Platformer

Little Nightmares
Shared: Adventure · Puzzle · Puzzle Platformer

Viewfinder
Shared: Puzzle · Puzzle Platformer · Adventure

Supraland
Shared: Adventure · Puzzle Platformer · Puzzle

Little Nightmares II
Shared: Adventure · Puzzle · Atmospheric

The Last Campfire
Shared: Adventure · Puzzle · Atmospheric

INSIDE
Shared: Puzzle Platformer · Atmospheric · Adventure

GRIS
Shared: Adventure · Atmospheric · Platformer

FAR: Lone Sails
Shared: Adventure · Atmospheric · Puzzle

Seen
Shared: Adventure · Puzzle · Platformer

Half-Life 2
Shared: FPS · Adventure · First-Person

Shady Part of Me
Shared: Puzzle · Platformer · Adventure

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

Papo & Yo
Shared: Adventure · 3D Platformer · Puzzle

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

Contrast
Shared: Adventure · Puzzle · Platformer

Ori and the Will of the Wisps
Shared: Platformer · Adventure · Atmospheric

Firewatch
Shared: Adventure · Atmospheric · First-Person

FEZ
Shared: Puzzle · Platformer · Adventure

Neva
Shared: Adventure · Platformer · Puzzle

Nihilumbra
Shared: Adventure · Platformer · Puzzle

