Games like Professor Madhouse
Games like Professor Madhouse include GRIS, Brothers - A Tale of Two Sons, Seen, Pikuniku, and Gorogoa. We matched them by the tags players give Professor Madhouse on Steam (Indie, Casual, Adventure, Family Friendly, and Singleplayer): closest matches first, and among equally close ones the better-known games.

GRIS
Shared: Indie · Atmospheric · Adventure

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

Seen
Shared: Indie · Adventure · Singleplayer

Pikuniku
Shared: Indie · Casual · Adventure

Gorogoa
Shared: Indie · Casual · Puzzle

ABZU
Shared: Atmospheric · Adventure · Casual

OneShot
Shared: Indie · Atmospheric · Singleplayer

Donut County
Shared: Indie · Casual · Adventure

Chants of Sennaar
Shared: Adventure · Indie · Singleplayer

The Last Campfire
Shared: Adventure · Indie · Singleplayer

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

Little Nightmares
Shared: Adventure · Atmospheric · Singleplayer

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

Little Inferno
Shared: Indie · Casual · Singleplayer

Journey
Shared: Indie · Adventure · Atmospheric

Unravel
Shared: Adventure · Action · Family Friendly

The Room
Shared: Adventure · Indie · Puzzle

Assemble with Care
Shared: Indie · Casual · Puzzle

Moncage
Shared: Casual · Indie · Adventure

There Is No Game: Wrong Dimension
Shared: Indie · Adventure · Casual

Stray
Shared: Adventure · Singleplayer · Atmospheric

BEEP
Shared: Indie · Adventure · Singleplayer

Hollow Knight: Silksong
Shared: Indie · Singleplayer · Great Soundtrack

Nihilumbra
Shared: Indie · Adventure · Casual