Games like Blaster Shooter GunGuy!
Games like Blaster Shooter GunGuy! include Geometry Dash, Celeste, Super Meat Boy, Broforce, and Jump King. We matched them by the tags players give Blaster Shooter GunGuy! on Steam (Side Scroller, Precision Platformer, Sandbox, Difficult, and Platformer): closest matches first, and among equally close ones the better-known games.

Geometry Dash
Shared: Difficult · Precision Platformer · 2D

Celeste
Shared: Precision Platformer · Difficult · Platformer

Super Meat Boy
Shared: Precision Platformer · Difficult · Platformer

Broforce
Shared: Platformer · 2D · Side Scroller

Jump King
Shared: Precision Platformer · Difficult · Platformer

Shovel Knight: Treasure Trove
Shared: Platformer · Difficult · Side Scroller

Downwell
Shared: Precision Platformer · Platformer · Arcade

Huntdown
Shared: Side Scroller · Shooter · 2D

Hollow Knight
Shared: Platformer · Difficult · 2D

Kero Blaster
Shared: Side Scroller · Platformer · Difficult

Rogue Legacy 2
Shared: Platformer · Arcade · Difficult

Skul: The Hero Slayer
Shared: 2D · Platformer · Action

Cuphead
Shared: Difficult · Platformer · 2D

SANABI
Shared: Action · 2D · Platformer

The End Is Nigh
Shared: Precision Platformer · Platformer · Difficult

Pogostuck: Rage With Your Friends
Shared: Precision Platformer · Difficult · Platformer

VVVVVV
Shared: Precision Platformer · Platformer · Difficult

Terraria
Shared: Sandbox · 2D · Adventure

Bloodstained: Curse of the Moon
Shared: Side Scroller · Platformer · 2D

Touhou Luna Nights
Shared: Side Scroller · Difficult · Platformer

Giana Sisters: Twisted Dreams
Shared: Side Scroller · Difficult · Platformer

METAL SLUG 3
Shared: Side Scroller · Arcade · Shooter

Hollow Knight: Silksong
Shared: Difficult · Platformer · 2D

Bit Blaster XL
Shared: Difficult · Shooter · Arcade