Games like Rogue Glitch Ultra
Games like Rogue Glitch Ultra include Skul: The Hero Slayer, The Binding of Isaac: Rebirth, Risk of Rain (2013), Vampire Survivors, and Caveblazers. We matched them by the tags players give Rogue Glitch Ultra on Steam (Action Roguelike, 2D Platformer, Roguelite, Difficult, and Platformer): closest matches first, and among equally close ones the better-known games.

Skul: The Hero Slayer
Shared: Action Roguelike · Roguelite · Roguelike

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Roguelike · Difficult

Risk of Rain (2013)
Shared: Action Roguelike · Roguelike · Platformer

Vampire Survivors
Shared: Action Roguelike · Roguelite · 2D

Caveblazers
Shared: Action Roguelike · Roguelite · Platformer

Dead Cells
Shared: Action Roguelike · Roguelike · Roguelite

Dungreed
Shared: Action Roguelike · Roguelite · Roguelike

Rogue Legacy
Shared: Action Roguelike · Platformer · Roguelike

Noita
Shared: Difficult · Roguelike · Action Roguelike

Enter the Gungeon
Shared: Action Roguelike · Difficult · Roguelike

Hades
Shared: Action Roguelike · Roguelite · Roguelike

Nuclear Throne
Shared: Action Roguelike · Roguelike · Difficult

Spelunky
Shared: Action Roguelike · Platformer · Roguelike

Risk of Rain 2
Shared: Action Roguelike · Roguelite · Roguelike

20XX
Shared: Action Roguelike · 2D Platformer · Platformer

30XX
Shared: Action Roguelike · 2D Platformer · Roguelite

Geometry Dash
Shared: Difficult · 2D · Platformer

Anomaly Agent
Shared: 2D Platformer · Action Roguelike · Platformer

Spiritfall
Shared: Action Roguelike · 2D Platformer · Roguelite

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

Celeste
Shared: Difficult · 2D Platformer · Platformer

Vagante
Shared: Action Roguelike · Difficult · Roguelite

The Binding of Isaac
Shared: Action Roguelike · Roguelike · Difficult

Spelunky 2
Shared: 2D Platformer · Platformer · Difficult