Games like XOL
Games like XOL include Portal, Portal 2, ALTF4, Human Fall Flat, and Clustertruck. We matched them by the tags players give XOL on Steam (Action, Physics, Isometric, 3D Platformer, and Arcade): closest matches first, and among equally close ones the better-known games.

Portal
Shared: 3D Platformer · Puzzle Platformer · Puzzle

Portal 2
Shared: Puzzle · Platformer · Puzzle Platformer

ALTF4
Shared: Physics · 3D Platformer · Action

Human Fall Flat
Shared: Physics · Puzzle · Action

Clustertruck
Shared: Action · 3D Platformer · Physics

EDGE
Shared: Action · Puzzle Platformer · Puzzle

Climber Animals: Together
Shared: Physics · Simulation · 3D Platformer

BONEWORKS
Shared: Physics · Action · Puzzle

Defy Gravity Extended
Shared: Puzzle Platformer · Action · Puzzle

Totally Accurate Battle Simulator
Shared: Physics · Simulation · Action

Neon White
Shared: 3D Platformer · Action · Parkour

LIMBO
Shared: Puzzle Platformer · Puzzle · Platformer

Tiny and Big: Grandpas Leftovers
Shared: Physics · 3D Platformer · Puzzle

Haste
Shared: Action · 3D Platformer · Parkour

Marble It Up! Ultra
Shared: Physics · 3D Platformer · Action

Bomb Rush Cyberfunk
Shared: Action · 3D Platformer · Parkour

Goat Simulator
Shared: Simulation · Physics · Action

SONIC X SHADOW GENERATIONS
Shared: Action · 3D Platformer · Platformer

Trine 3: The Artifacts of Power
Shared: 3D Platformer · Puzzle Platformer · Puzzle

Fun with Ragdolls: The Game
Shared: Physics · Action · Simulation

Mirror's Edge™
Shared: 3D Platformer · Parkour · Action

Wreckfest
Shared: Physics · Action · Simulation

Nuclear Option
Shared: Action · Simulation · Physics

Cyber Hook
Shared: 3D Platformer · Action · Parkour