Games like The Gateway Trilogy
Games like The Gateway Trilogy include Machinarium, Gorogoa, The Room, Stray, and Rusty Lake Paradise. We matched them by the tags players give The Gateway Trilogy on Steam (Point & Click, Exploration, Puzzle, Casual, and 2D): closest matches first, and among equally close ones the better-known games.

Machinarium
Shared: Point & Click · Puzzle · 2D

Gorogoa
Shared: Puzzle · Point & Click · Casual

The Room
Shared: Point & Click · Puzzle · Singleplayer

Stray
Shared: Exploration · Singleplayer · Puzzle

Rusty Lake Paradise
Shared: Point & Click · Puzzle · Singleplayer

Fran Bow
Shared: Point & Click · Puzzle · Story Rich

There Is No Game: Wrong Dimension
Shared: Point & Click · Puzzle · Casual

The Room 4: Old Sins
Shared: Point & Click · Puzzle · Singleplayer

Servant of the Lake
Shared: Point & Click · Puzzle · Atmospheric

Chants of Sennaar
Shared: Puzzle · Point & Click · Singleplayer

Papers, Please
Shared: Point & Click · Puzzle · Singleplayer

OneShot
Shared: Puzzle · Story Rich · Singleplayer

Sally Face - Episode One
Shared: Puzzle · Point & Click · Story Rich

Spirit of the North
Shared: Exploration · Puzzle · Casual

LIMBO
Shared: Puzzle · 2D · Atmospheric

The House of Da Vinci
Shared: Puzzle · Point & Click · Exploration

The Room Three
Shared: Puzzle · Point & Click · Singleplayer

Antichamber
Shared: Puzzle · Exploration · Singleplayer

Outer Wilds
Shared: Exploration · Puzzle · Story Rich

Moncage
Shared: Puzzle · Casual · Singleplayer

The Room Two
Shared: Point & Click · Puzzle · Atmospheric

The Dream Machine: Chapter 1 & 2
Shared: Point & Click · Puzzle · 2D

Samsara Room
Shared: Puzzle · Point & Click · Singleplayer

Cube Escape Collection
Shared: Point & Click · Puzzle · Singleplayer