Games like Papo & Yo
Games like Papo & Yo include Portal 2, Brothers - A Tale of Two Sons, LIMBO, The Last Campfire, and Little Nightmares. We matched them by the tags players give Papo & Yo on Steam (3D Platformer, Puzzle Platformer, Indie, Adventure, and Puzzle): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Puzzle · Platformer · Singleplayer

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

LIMBO
Shared: Puzzle Platformer · Indie · Puzzle

The Last Campfire
Shared: Adventure · Puzzle · Indie

Little Nightmares
Shared: Adventure · Puzzle Platformer · Singleplayer

A Story About My Uncle
Shared: Adventure · Indie · 3D Platformer

Portal
Shared: Puzzle Platformer · 3D Platformer · Puzzle

Viewfinder
Shared: Puzzle Platformer · Puzzle · Singleplayer

INSIDE
Shared: Puzzle Platformer · Indie · Story Rich

Contrast
Shared: Indie · Adventure · Puzzle

Chained Together
Shared: Adventure · Platformer · Puzzle Platformer

FAR: Lone Sails
Shared: Adventure · Indie · Singleplayer

Shady Part of Me
Shared: Indie · Puzzle · 3D Platformer

GRIS
Shared: Indie · Adventure · Platformer

Little Nightmares II
Shared: Adventure · Puzzle · Singleplayer

Seen
Shared: Indie · Adventure · Puzzle

Nihilumbra
Shared: Indie · Adventure · Puzzle Platformer

The Beginner's Guide
Shared: Indie · Story Rich · Adventure

FEZ
Shared: Indie · Puzzle · Platformer

To the Moon
Shared: Indie · Story Rich · Adventure

Planet of Lana
Shared: Puzzle Platformer · Puzzle · Adventure

Refunct
Shared: 3D Platformer · Puzzle Platformer · Platformer

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

Neva
Shared: Adventure · Indie · Platformer