Games like Watermelon Blocks
Games like Watermelon Blocks include FEZ, Portal 2, Trine 2: Complete Story, Braid, and LIMBO. We matched them by the tags players give Watermelon Blocks on Steam (Casual, Puzzle Platformer, 2D Platformer, Puzzle, and Relaxing): closest matches first, and among equally close ones the better-known games.

FEZ
Shared: Puzzle · Platformer · Casual

Portal 2
Shared: Puzzle · Singleplayer · Puzzle Platformer

Trine 2: Complete Story
Shared: Puzzle Platformer · 2D Platformer · Puzzle

Braid
Shared: Puzzle Platformer · 2D Platformer · Puzzle

LIMBO
Shared: Puzzle Platformer · Puzzle · Platformer

Moonleap
Shared: Puzzle Platformer · Puzzle · Platformer

Celeste
Shared: 2D Platformer · Pixel Graphics · Platformer

Monument Valley
Shared: Puzzle · Casual · Relaxing

Webbed
Shared: 2D Platformer · Puzzle Platformer · Pixel Graphics

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

Laughing to Die
Shared: Casual · Puzzle · 2D Platformer

DAVE THE DIVER
Shared: Casual · Relaxing · Adventure

SANABI
Shared: 2D Platformer · Pixel Graphics · Singleplayer

Unpacking
Shared: Casual · Relaxing · Puzzle

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

GRIS
Shared: Adventure · Singleplayer · Relaxing

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

Zup! S
Shared: Casual · Puzzle · Relaxing

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

ANIMAL WELL
Shared: Puzzle · Puzzle Platformer · Platformer

Squishy the Suicidal Pig
Shared: Puzzle Platformer · Puzzle · Platformer

Neva
Shared: Adventure · Puzzle · Platformer

ElecHead
Shared: Puzzle Platformer · Puzzle · Platformer

Zup!
Shared: Casual · Puzzle · Puzzle Platformer