Games like Hello World
Games like Hello World include Portal 2, Pikuniku, Trine 2: Complete Story, Chained Together, and Laughing to Die. We matched them by the tags players give Hello World on Steam (Adventure, Puzzle, Casual, Action-Adventure, and Platformer): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Puzzle · Platformer · Puzzle Platformer

Pikuniku
Shared: Adventure · Casual · Puzzle

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

Chained Together
Shared: Adventure · Casual · Platformer

Laughing to Die
Shared: Adventure · Puzzle · Casual

LIMBO
Shared: Puzzle · Platformer · Adventure

FEZ
Shared: Puzzle · Platformer · Adventure

Webbed
Shared: 2D Platformer · Platformer · Puzzle Platformer

Braid
Shared: Puzzle · 2D Platformer · Puzzle Platformer

Hue
Shared: Puzzle · Adventure · Platformer

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

Human Fall Flat
Shared: Puzzle · Adventure · Puzzle Platformer

Planet of Lana
Shared: Puzzle · Puzzle Platformer · Adventure

CATO: Buttered Cat
Shared: Adventure · Puzzle · Puzzle Platformer

Creepy Tale
Shared: Adventure · Puzzle · Puzzle Platformer

Neva
Shared: Adventure · Platformer · Puzzle

Thank Goodness You're Here!
Shared: Adventure · Casual · 2D Platformer

Scribblenauts Unlimited
Shared: Puzzle · Adventure · Casual

Donut County
Shared: Casual · Puzzle · Adventure

Sonic Superstars
Shared: Adventure · Platformer · Casual

Nihilumbra
Shared: Adventure · Puzzle · Casual

Squishy the Suicidal Pig
Shared: Puzzle · Adventure · Platformer

Munin
Shared: Casual · Puzzle · Adventure

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