Games like GunWorld
Games like GunWorld include Shovel Knight: Treasure Trove, Broforce, Katana ZERO, Skul: The Hero Slayer, and The Messenger. We matched them by the tags players give GunWorld on Steam (Action, Indie, Platformer, Pixel Graphics, and Retro): closest matches first, and among equally close ones the better-known games.

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

Broforce
Shared: Action · Pixel Graphics · Platformer

Katana ZERO
Shared: Action · Pixel Graphics · Platformer

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

The Messenger
Shared: Platformer · Retro · Pixel Graphics

SANABI
Shared: Action · Pixel Graphics · Indie

Hotline Miami
Shared: Action · Indie · Pixel Graphics

Out There Somewhere
Shared: Platformer · Indie · Pixel Graphics

Super Meat Boy
Shared: Platformer · Indie · Pixel Graphics

Axiom Verge
Shared: Indie · Platformer · Pixel Graphics

Gravity Circuit
Shared: Action · Indie · Platformer

UFO 50
Shared: Indie · Action · Pixel Graphics

Bloodstained: Curse of the Moon
Shared: Action · Pixel Graphics · Platformer

Angry Video Game Nerd Adventures
Shared: Indie · Action · Platformer

Gato Roboto
Shared: Indie · Action · Pixel Graphics

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

VVVVVV
Shared: Pixel Graphics · Platformer · Indie

Duck Game
Shared: Action · Pixel Graphics · Platformer

Pizza Tower
Shared: Indie · Platformer · Pixel Graphics

Celeste
Shared: Pixel Graphics · Indie · Platformer

Freedom Planet
Shared: Action · Platformer · Indie

Jump King
Shared: Indie · Pixel Graphics · Platformer

Rogue Legacy
Shared: Platformer · Indie · Action

Downwell
Shared: Indie · Pixel Graphics · Platformer