Games like Atomik: RunGunJumpGun
Games like Atomik: RunGunJumpGun include Celeste, Katana ZERO, Hollow Knight, Hollow Knight: Silksong, and Cuphead. We matched them by the tags players give Atomik: RunGunJumpGun on Steam (Action, Indie, Pixel Graphics, Platformer, and Difficult): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Pixel Graphics · Indie · Difficult

Katana ZERO
Shared: Action · Pixel Graphics · Platformer

Hollow Knight
Shared: Platformer · Difficult · Indie

Hollow Knight: Silksong
Shared: Indie · Difficult · Great Soundtrack

Cuphead
Shared: Difficult · Platformer · Indie

Skul: The Hero Slayer
Shared: Action · Indie · Pixel Graphics

Shovel Knight: Treasure Trove
Shared: Pixel Graphics · Platformer · Indie

Super Meat Boy
Shared: Indie · Platformer · Difficult

Geometry Dash
Shared: Difficult · 2D · Great Soundtrack

Pizza Tower
Shared: Indie · Great Soundtrack · Platformer

SANABI
Shared: Action · Pixel Graphics · Indie

Hotline Miami
Shared: Action · Indie · Pixel Graphics

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

The Binding of Isaac: Rebirth
Shared: Indie · Pixel Graphics · Difficult

Hotline Miami 2: Wrong Number
Shared: Pixel Graphics · Action · Great Soundtrack

Out There Somewhere
Shared: Indie · Pixel Graphics · Platformer

Hyper Light Drifter
Shared: Pixel Graphics · Indie · Action

VVVVVV
Shared: Pixel Graphics · Indie · Platformer

Blasphemous
Shared: Pixel Graphics · Indie · 2D

The Messenger
Shared: Platformer · Pixel Graphics · Indie

LUFTRAUSERS
Shared: Indie · Action · Pixel Graphics

Vampire Survivors
Shared: Pixel Graphics · Indie · 2D

Axiom Verge
Shared: Indie · Pixel Graphics · Action

Electronic Super Joy
Shared: Indie · Platformer · Action