Games like Guntastic
Games like Guntastic include Broforce, Duck Game, Streets of Rage 4, Rivals of Aether, and UFO 50. We matched them by the tags players give Guntastic on Steam (Action, Indie, Casual, Beat 'em up, and Platformer): closest matches first, and among equally close ones the better-known games.

Broforce
Shared: Action · Pixel Graphics · 2D

Duck Game
Shared: Action · Pixel Graphics · Indie

Streets of Rage 4
Shared: Action · Indie · Beat 'em up

Rivals of Aether
Shared: Indie · Pixel Graphics · Platformer

UFO 50
Shared: Indie · Action · Pixel Graphics

Timberman
Shared: Casual · Indie · Action

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

Katana ZERO
Shared: Action · Pixel Graphics · Platformer

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

Kung Fury: Street Rage - Ultimate Edition
Shared: Indie · Action · Beat 'em up

TowerFall Ascension
Shared: Indie · Action · Platformer

SANABI
Shared: Action · Pixel Graphics · Indie

Vampire Survivors
Shared: Indie · Pixel Graphics · 2D

Move or Die
Shared: Action · Indie · 2D

Stick Fight: The Game
Shared: Action · Local Multiplayer · Casual

Gravity Circuit
Shared: Action · Indie · Platformer

Downwell
Shared: Indie · Pixel Graphics · Action

Teenage Mutant Ninja Turtles: Shredder's Revenge
Shared: Beat 'em up · Pixel Graphics · 2D

One Finger Death Punch
Shared: Action · Indie · Beat 'em up

Brawlhalla
Shared: Casual · Platformer · Action

The Messenger
Shared: Platformer · Retro · Indie

Huntdown
Shared: Action · Pixel Graphics · 2D

SpeedRunners
Shared: Indie · Action · Platformer

Super Meat Boy
Shared: Indie · Platformer · 2D