Games like Dimensions
Games like Dimensions include Thomas Was Alone, Celeste, Anomaly Agent, Trine 2: Complete Story, and Trine Enchanted Edition. We matched them by the tags players give Dimensions on Steam (Precision Platformer, Side Scroller, 2D Platformer, Shoot 'Em Up, and Sci-fi): closest matches first, and among equally close ones the better-known games.

Thomas Was Alone
Shared: Side Scroller · Precision Platformer · 2D Platformer

Celeste
Shared: Precision Platformer · 2D Platformer · Platformer

Anomaly Agent
Shared: Side Scroller · 2D Platformer · Hack and Slash

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

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

Prince of Persia The Lost Crown
Shared: 2D Platformer · Side Scroller · Precision Platformer

Super Meat Boy
Shared: Precision Platformer · 2D Platformer · Platformer

SANABI
Shared: 2D Platformer · Action · Side Scroller

Huntdown
Shared: Side Scroller · Shoot 'Em Up · Shooter

VVVVVV
Shared: Precision Platformer · 2D Platformer · Platformer

Zombotron
Shared: Sci-fi · Side Scroller · Shoot 'Em Up

Blasphemous 2
Shared: 2D Platformer · Side Scroller · Hack and Slash

The Pedestrian
Shared: Side Scroller · Puzzle Platformer · 2D Platformer

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

Olija
Shared: 2D Platformer · Platformer · Precision Platformer

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

Iron Meat
Shared: Side Scroller · 2D Platformer · Sci-fi

Downwell
Shared: Precision Platformer · 2D Platformer · Platformer

ICEY
Shared: Side Scroller · Hack and Slash · Action

Bō: Path of the Teal Lotus
Shared: Precision Platformer · Side Scroller · 2D Platformer

Soda Crisis
Shared: Side Scroller · Shoot 'Em Up · Platformer

Axiom Verge 2
Shared: 2D Platformer · Side Scroller · Platformer

Afterimage
Shared: 2D Platformer · Side Scroller · Hack and Slash

Warhammer 40,000: Shootas, Blood & Teef
Shared: Side Scroller · 2D Platformer · Shoot 'Em Up