Games like Quantumleaper
Games like Quantumleaper include Portal 2, Trine 2: Complete Story, Öoo, INSIDE, and Webbed. We matched them by the tags players give Quantumleaper on Steam (Puzzle Platformer, Action-Adventure, Exploration, 2.5D, and Sci-fi): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Puzzle Platformer · Platformer · Puzzle

Trine 2: Complete Story
Shared: Puzzle Platformer · Action-Adventure · 2D Platformer

Öoo
Shared: Puzzle Platformer · Exploration · 2D Platformer

INSIDE
Shared: Puzzle Platformer · 2.5D · 2D Platformer

Webbed
Shared: Puzzle Platformer · 2D Platformer · Exploration

STAR WARS Jedi: Fallen Order™
Shared: Action-Adventure · Exploration · Sci-fi

FAR: Changing Tides
Shared: Action-Adventure · Puzzle Platformer · 2.5D

Trine Enchanted Edition
Shared: Puzzle Platformer · Action-Adventure · 2D Platformer

ANIMAL WELL
Shared: Exploration · Puzzle Platformer · Puzzle

LIMBO
Shared: Puzzle Platformer · Platformer · Puzzle

FEZ
Shared: Exploration · Platformer · Puzzle

Portal
Shared: Puzzle Platformer · Puzzle · Sci-fi

FAR: Lone Sails
Shared: Exploration · 2.5D · Puzzle Platformer

ANTONBLAST
Shared: 2D Platformer · Exploration · Puzzle Platformer

COCOON
Shared: Exploration · Puzzle Platformer · Puzzle

Planet of Lana
Shared: Puzzle Platformer · 2D Platformer · Puzzle

Mind Over Magnet
Shared: Puzzle Platformer · Puzzle · 2D Platformer

Darwin's Paradox!
Shared: Action-Adventure · Puzzle Platformer · Platformer

F.I.S.T.: Forged In Shadow Torch
Shared: Platformer · 2D Platformer · Exploration

Leap Year
Shared: Exploration · Puzzle Platformer · 2D Platformer

Creepy Tale
Shared: Puzzle Platformer · 2D Platformer · Puzzle

Trine 5: A Clockwork Conspiracy
Shared: Action-Adventure · Puzzle Platformer · Platformer

Defy Gravity Extended
Shared: Puzzle Platformer · Platformer · Puzzle

Ori and the Will of the Wisps
Shared: Platformer · Exploration · Action-Adventure