Games like Blocks That Matter
Games like Blocks That Matter include Portal 2, LIMBO, Braid, Thank Goodness You're Here!, and GRIS. We matched them by the tags players give Blocks That Matter on Steam (Funny, Singleplayer, Platformer, Puzzle, and Puzzle Platformer): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Singleplayer · Platformer · Puzzle

LIMBO
Shared: Puzzle Platformer · Platformer · Puzzle

Braid
Shared: Puzzle · Puzzle Platformer · Platformer

Thank Goodness You're Here!
Shared: Funny · Hand-drawn · Adventure

GRIS
Shared: Platformer · Singleplayer · Hand-drawn

Pikuniku
Shared: Puzzle · Funny · Indie

FEZ
Shared: Platformer · Puzzle · Singleplayer

Laughing to Die
Shared: Platformer · Puzzle · Casual

Hollow Knight
Shared: Platformer · Singleplayer · 2D

Defy Gravity Extended
Shared: Platformer · Puzzle Platformer · Puzzle

Pizza Tower
Shared: Funny · 2D Platformer · Platformer

Planet of Lana
Shared: Puzzle Platformer · Singleplayer · Puzzle

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

The Bridge
Shared: Puzzle Platformer · Hand-drawn · Singleplayer

Celeste
Shared: Platformer · Singleplayer · 2D Platformer

Portal
Shared: Puzzle · Singleplayer · Puzzle Platformer

Plants vs. Zombies GOTY Edition
Shared: Singleplayer · Funny · Casual

Scribblenauts Unlimited
Shared: Puzzle · Singleplayer · Funny

Mind Over Magnet
Shared: Puzzle · Puzzle Platformer · Platformer

BEEP
Shared: Platformer · Singleplayer · Puzzle

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

Hidden Folks
Shared: Puzzle · Hand-drawn · Funny

There Is No Game: Wrong Dimension
Shared: Puzzle · Funny · Indie

Human Fall Flat
Shared: Funny · Puzzle · Puzzle Platformer