Games like Spectrum
Games like Spectrum include Celeste, Super Meat Boy, VVVVVV, Thomas Was Alone, and Braid. We matched them by the tags players give Spectrum on Steam (2D Platformer, Precision Platformer, Casual, Colorful, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Precision Platformer · 2D Platformer · Pixel Graphics

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

VVVVVV
Shared: Precision Platformer · 2D Platformer · Pixel Graphics

Thomas Was Alone
Shared: 2D Platformer · Precision Platformer · Puzzle Platformer

Braid
Shared: 2D Platformer · Puzzle Platformer · Singleplayer

Pizza Tower
Shared: 2D Platformer · Singleplayer · Indie

Downwell
Shared: Precision Platformer · 2D Platformer · Pixel Graphics

Geometry Dash
Shared: Precision Platformer · Singleplayer · Colorful

FEZ
Shared: Singleplayer · Platformer · Casual

SANABI
Shared: 2D Platformer · Pixel Graphics · Singleplayer

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

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

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

Strange Jigsaws
Shared: Casual · Colorful · Abstract

LIMBO
Shared: Puzzle Platformer · Singleplayer · Indie

Moonleap
Shared: Puzzle Platformer · Minimalist · Pixel Graphics

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

Trine Enchanted Edition
Shared: 2D Platformer · Puzzle Platformer · Colorful

Defy Gravity Extended
Shared: Puzzle Platformer · Singleplayer · Platformer

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

Hue
Shared: Colorful · Puzzle Platformer · Indie

Hook
Shared: Casual · Minimalist · Singleplayer

Öoo
Shared: 2D Platformer · Puzzle Platformer · Platformer

Level Devil
Shared: 2D Platformer · Minimalist · Colorful