Games like Star Gun
Games like Star Gun include Broforce, The Binding of Isaac: Rebirth, Enter the Gungeon, Cuphead, and Star of Providence. We matched them by the tags players give Star Gun on Steam (Shoot 'Em Up, Difficult, Local Co-Op, Procedural Generation, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.
Broforce
Shared: Pixel Graphics · Local Co-Op · Action
The Binding of Isaac: Rebirth
Shared: Difficult · Pixel Graphics · Local Co-Op
Enter the Gungeon
Shared: Difficult · Pixel Graphics · Local Co-Op
Cuphead
Shared: Difficult · Local Co-Op · 2D
Star of Providence
Shared: Shoot 'Em Up · Roguelite · Difficult
Nuclear Throne
Shared: Difficult · Pixel Graphics · Roguelite
Vampire Survivors
Shared: Pixel Graphics · Roguelite · 2D
Bit Blaster XL
Shared: Shoot 'Em Up · Difficult · Shooter
Skul: The Hero Slayer
Shared: Pixel Graphics · Action · Roguelite
Wizard of Legend
Shared: Pixel Graphics · Local Co-Op · Roguelite
Huntdown
Shared: Pixel Graphics · Shoot 'Em Up · Local Co-Op
Lovers in a Dangerous Spacetime
Shared: Local Co-Op · Local Multiplayer · Co-op Campaign
ZeroRanger
Shared: Shoot 'Em Up · Pixel Graphics · Action
Duck Game
Shared: Pixel Graphics · Local Multiplayer · Action
Blazing Chrome
Shared: Shoot 'Em Up · Pixel Graphics · Action
Door Kickers: Action Squad
Shared: Local Co-Op · Pixel Graphics · Action
Ikaruga
Shared: Shoot 'Em Up · Difficult · Action
Voidigo
Shared: Local Co-Op · Shoot 'Em Up · Roguelite
Wall World
Shared: Roguelite · Pixel Graphics · Difficult
Crypt of the NecroDancer
Shared: Pixel Graphics · Difficult · Local Co-Op
Noita
Shared: Difficult · Pixel Graphics · 2D
Spelunky
Shared: Difficult · Local Co-Op · Procedural Generation
Risk of Rain (2013)
Shared: Pixel Graphics · Difficult · Action
Streets of Rogue
Shared: Roguelite · Pixel Graphics · Local Co-Op