Games like Lemma
Games like Lemma include Portal 2, Portal, A Story About My Uncle, Teardown, and Clustertruck. We matched them by the tags players give Lemma on Steam (Parkour, Voxel, 3D Platformer, Story Rich, and Puzzle Platformer): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Story Rich · Puzzle Platformer · First-Person

Portal
Shared: 3D Platformer · Puzzle Platformer · First-Person

A Story About My Uncle
Shared: Parkour · First-Person · Adventure

Teardown
Shared: Voxel · Physics · Destruction

Clustertruck
Shared: Parkour · 3D Platformer · First-Person

Viewfinder
Shared: Puzzle Platformer · First-Person · Physics

Refunct
Shared: Parkour · 3D Platformer · Puzzle Platformer

Valley
Shared: Parkour · First-Person · Adventure

Superliminal
Shared: First-Person · Physics · Story Rich

Firewatch
Shared: Story Rich · Adventure · First-Person

The Beginner's Guide
Shared: Story Rich · First-Person · Indie

Supraland
Shared: Puzzle Platformer · Physics · First-Person

Half-Life 2
Shared: Story Rich · First-Person · Singleplayer

INSIDE
Shared: Puzzle Platformer · Story Rich · Indie

Mirror's Edge™ Catalyst
Shared: Parkour · 3D Platformer · First-Person

Neon White
Shared: 3D Platformer · Parkour · Indie

Marvel’s Spider-Man Remastered
Shared: Story Rich · Parkour · Adventure

Little Nightmares
Shared: Puzzle Platformer · Adventure · Story Rich

Dishonored 2
Shared: First-Person · Story Rich · Parkour

Mirror's Edge™
Shared: Parkour · 3D Platformer · First-Person

BioShock Infinite
Shared: Story Rich · First-Person · Singleplayer

VHOLUME
Shared: Parkour · 3D Platformer · First-Person

Prince of Persia®: The Sands of Time
Shared: Parkour · Adventure · Puzzle Platformer

Assassin's Creed 2
Shared: Parkour · Story Rich · Adventure