Games like IAI // BREAKER
Games like IAI // BREAKER include Vampire Survivors, LUFTRAUSERS, Bit Blaster XL, Planes, Bullets and Vodka, and Exit the Gungeon. We matched them by the tags players give IAI // BREAKER on Steam (Spectacle fighter, Bullet Hell, PvE, Action, and Shooter): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · 2D · Action

LUFTRAUSERS
Shared: Bullet Hell · Action · Arcade

Bit Blaster XL
Shared: Bullet Hell · Shooter · Arcade

Planes, Bullets and Vodka
Shared: Action · Bullet Hell · Arcade

Exit the Gungeon
Shared: Action · Bullet Hell · Arcade

HELLDIVERS™ 2
Shared: PvE · Shooter · Action

BALL x PIT
Shared: Action · Bullet Hell · Arcade

METAL GEAR RISING: REVENGEANCE
Shared: Spectacle fighter · Action · Swordplay

Nova Drift
Shared: Bullet Hell · Arcade · Shooter

Touhou Kouryudou ~ Unconnected Marketeers.
Shared: Bullet Hell · Action · Shooter

Windowkill
Shared: Action · Bullet Hell · Arcade

Dead as Disco
Shared: Spectacle fighter · PvE · Action

DJMAX RESPECT V
Shared: Action · Cute · 2D

Commando Collection
Shared: Action · Bullet Hell · Shooter

Revolution Ace
Shared: Bullet Hell · Action · Shooter

Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Bullet Hell · Action · 2D

Ikaruga
Shared: Bullet Hell · Action · Arcade

Touhou Kinjoukyou ~ Fossilized Wonders.
Shared: Bullet Hell · Action · Shooter

ZeroRanger
Shared: Bullet Hell · Action · Arcade

Megabonk
Shared: Bullet Hell · Action · Indie

DRAINUS
Shared: Action · Shooter · Bullet Hell

Star Saviors
Shared: Bullet Hell · Action · Arcade

Rogue: Genesia
Shared: Bullet Hell · PvE · Arcade

Broforce
Shared: Action · 2D · Shooter