Games like Red Pistol
Games like Red Pistol include Megabonk, Vampire Survivors, Enter the Gungeon, Nordic Ashes: Survivors of Ragnarok, and Death Must Die. We matched them by the tags players give Red Pistol on Steam (Action Roguelike, Bullet Hell, Bullet Heaven, Western, and Exploration): closest matches first, and among equally close ones the better-known games.

Megabonk
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelike

Enter the Gungeon
Shared: Action Roguelike · Bullet Hell · Roguelike

Nordic Ashes: Survivors of Ragnarok
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Death Must Die
Shared: Action Roguelike · Bullet Hell · Bullet Heaven

Nova Drift
Shared: Bullet Hell · Action Roguelike · Shoot 'Em Up

BALL x PIT
Shared: Bullet Hell · Action Roguelike · Roguelike

Halls of Torment
Shared: Action Roguelike · Bullet Hell · Roguelike

Brotato
Shared: Bullet Hell · Action Roguelike · Roguelike

Neon Abyss
Shared: Bullet Heaven · Roguelike · Procedural Generation

Realm of the Mad God Exalt
Shared: Bullet Hell · Action Roguelike · Roguelike

20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Shoot 'Em Up

Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Roguelike

Star of Providence
Shared: Bullet Hell · Action Roguelike · Shoot 'Em Up

Soulstone Survivors
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Bullet Heaven

Dead Estate
Shared: Action Roguelike · Bullet Hell · Roguelike

The Binding of Isaac
Shared: Action Roguelike · Roguelike · Procedural Generation

Necrosmith
Shared: Action Roguelike · Bullet Hell · Zombies

Deep Rock Galactic: Survivor
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Pathogenic
Shared: Bullet Hell · Action Roguelike · Bullet Heaven

I Am Legion: Stand Survivors
Shared: Action Roguelike · Bullet Hell · Shoot 'Em Up

Noobs Want to Live
Shared: Bullet Hell · Action Roguelike · Roguelike

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Roguelike · Indie