Games like Glitch Protocol
Games like Glitch Protocol include Super Meat Boy, Celeste, Pizza Tower, SANABI, and Katana ZERO. We matched them by the tags players give Glitch Protocol on Steam (Action, Singleplayer, 2D Platformer, Platformer, and Arcade): closest matches first, and among equally close ones the better-known games.

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

Celeste
Shared: Precision Platformer · Platformer · 2D Platformer

Pizza Tower
Shared: 2D Platformer · Indie · Platformer

SANABI
Shared: Action · 2D Platformer · Singleplayer

Katana ZERO
Shared: Action · Platformer · 2D Platformer

Geometry Dash
Shared: Singleplayer · Difficult · Platformer

Downwell
Shared: Platformer · Action · Precision Platformer

Hollow Knight
Shared: Platformer · Singleplayer · Indie

VVVVVV
Shared: Platformer · 2D Platformer · Indie

Rogue Legacy 2
Shared: Action · Arcade · Platformer

Jump King
Shared: Indie · Action · Platformer

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

Hollow Knight: Silksong
Shared: Indie · Singleplayer · Difficult

A Dance of Fire and Ice
Shared: Singleplayer · Indie · Difficult

Super Hexagon
Shared: Indie · Arcade · Singleplayer

Super Meat Boy Forever
Shared: Action · Indie · Platformer

Shovel Knight: Treasure Trove
Shared: Platformer · Action · Indie

The End Is Nigh
Shared: Platformer · Indie · Singleplayer

Ori and the Will of the Wisps
Shared: Platformer · Singleplayer · Action

Exit the Gungeon
Shared: Action · Arcade · Indie

Gravity Circuit
Shared: Action · Platformer · Singleplayer

The Messenger
Shared: Platformer · Action · Retro

Ambidextro
Shared: Action · 2D Platformer · Precision Platformer

N++ (NPLUSPLUS)
Shared: 2D Platformer · Action · Precision Platformer