Games like Toolboy
Games like Toolboy include LIMBO, INSIDE, Seen, Portal 2, and Little Nightmares. We matched them by the tags players give Toolboy on Steam (Indie, Adventure, Puzzle, Physics, and Singleplayer): closest matches first, and among equally close ones the better-known games.

LIMBO
Shared: Indie · Puzzle · Adventure

INSIDE
Shared: 2.5D · Indie · Adventure

Seen
Shared: Indie · Adventure · Puzzle

Portal 2
Shared: Puzzle · Singleplayer · Platformer

Little Nightmares
Shared: Adventure · Singleplayer · Indie

FEZ
Shared: Indie · Puzzle · Platformer

BEEP
Shared: Indie · Adventure · Singleplayer

FAR: Lone Sails
Shared: Adventure · Indie · Singleplayer

Chants of Sennaar
Shared: Adventure · Puzzle · Indie

Human Fall Flat
Shared: Puzzle · Adventure · Physics

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

GRIS
Shared: Indie · Adventure · Singleplayer

The Last Campfire
Shared: Adventure · Puzzle · Indie

Zup! S
Shared: Indie · Puzzle · Physics

Little Nightmares II
Shared: Adventure · Puzzle · Singleplayer

Getting Over It with Bennett Foddy
Shared: Physics · Singleplayer · Indie

Donut County
Shared: Indie · Puzzle · Physics

Viewfinder
Shared: Puzzle · Singleplayer · Adventure

Defy Gravity Extended
Shared: Indie · Puzzle · Platformer

Nihilumbra
Shared: Indie · Adventure · Puzzle

A Story About My Uncle
Shared: Adventure · Indie · Singleplayer

Max: The Curse of Brotherhood
Shared: Adventure · Puzzle · Singleplayer

Hollow Knight
Shared: Indie · Platformer · Singleplayer

Unravel
Shared: Adventure · Puzzle · Singleplayer