Games like Shooter
Games like Shooter include Celeste, SANABI, Super Meat Boy, Momodora: Reverie Under The Moonlight, and Rain World. We matched them by the tags players give Shooter on Steam (Side Scroller, Difficult, Shooter, 2D Platformer, and 2D): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Difficult · 2D Platformer · Pixel Graphics

SANABI
Shared: 2D Platformer · Action · Pixel Graphics

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

Momodora: Reverie Under The Moonlight
Shared: Side Scroller · 2D Platformer · Difficult

Rain World
Shared: Difficult · Atmospheric · 2D

Geometry Dash
Shared: Difficult · 2D · Side Scroller

Broforce
Shared: Action · 2D · Side Scroller

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

Hollow Knight
Shared: Difficult · 2D · Atmospheric

Huntdown
Shared: Side Scroller · Shooter · Action

Katana ZERO
Shared: Action · 2D Platformer · Pixel Graphics

NINJA GAIDEN: Ragebound
Shared: Side Scroller · 2D Platformer · Action

Shovel Knight: Treasure Trove
Shared: 2D · Difficult · Pixel Graphics

Jump King
Shared: Difficult · 2D · Pixel Graphics

DEADBOLT
Shared: 2D · Difficult · Side Scroller

VVVVVV
Shared: 2D Platformer · Difficult · Pixel Graphics

Blasphemous 2
Shared: Difficult · Side Scroller · 2D Platformer

Webbed
Shared: 2D Platformer · Cute · 2D

Pizza Tower
Shared: 2D Platformer · 2D · Pixel Graphics

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

Bread & Fred
Shared: Cute · Difficult · 2D Platformer

Door Kickers: Action Squad
Shared: 2D Platformer · Shooter · Action

Hotline Miami 2: Wrong Number
Shared: Difficult · Action · Pixel Graphics

The Messenger
Shared: 2D · 2D Platformer · Pixel Graphics