Games like Kingdom Gun
Games like Kingdom Gun include Risk of Rain 2, Dead Cells, Skul: The Hero Slayer, Hades, and Megabonk. We matched them by the tags players give Kingdom Gun on Steam (Action Roguelike, Shooter, Action, Loot, and Magic): closest matches first, and among equally close ones the better-known games.

Risk of Rain 2
Shared: Action Roguelike · Action · Roguelike

Dead Cells
Shared: Action Roguelike · Adventure · Roguelike

Skul: The Hero Slayer
Shared: Action Roguelike · Action · Roguelike

Hades
Shared: Action Roguelike · Action · Roguelike

Megabonk
Shared: Action Roguelike · Loot · Roguelike

Wizard of Legend
Shared: Action Roguelike · Action · Magic

Gunfire Reborn
Shared: Roguelike · Action Roguelike · Action

BlazBlue Entropy Effect
Shared: Action Roguelike · Action · Platformer

Hades II
Shared: Action · Action Roguelike · Roguelike

Neon Abyss
Shared: Loot · Roguelike · Shooter

Rogue Legacy
Shared: Action Roguelike · Action · Roguelike

Borderlands 2
Shared: Shooter · Loot · Action

Enter the Gungeon
Shared: Action Roguelike · Roguelike · Action

Risk of Rain (2013)
Shared: Action Roguelike · Action · Roguelike

Dungreed
Shared: Action Roguelike · Action · Roguelike

Tower of Babel: Survivors of Chaos
Shared: Action Roguelike · Loot · Action

Death Must Die
Shared: Action Roguelike · Action · Roguelike

Vampire Survivors
Shared: Action Roguelike · Action · Roguelike

Crab Champions
Shared: Action Roguelike · Roguelike · Shooter

Hero Siege
Shared: Action Roguelike · Action · Hack and Slash

BPM: BULLETS PER MINUTE
Shared: Action · Shooter · Action Roguelike

Nuclear Throne
Shared: Action Roguelike · Action · Roguelike

Anomaly Agent
Shared: Action Roguelike · Platformer · Hack and Slash

Escape From Duckov
Shared: Action · Shooter · Adventure