Games like KAMUI
Games like KAMUI include LUFTRAUSERS, ZeroRanger, Ikaruga, Star Saviors, and Hotline Miami. We matched them by the tags players give KAMUI on Steam (Action, Indie, Shoot 'Em Up, Bullet Hell, and Shooter): closest matches first, and among equally close ones the better-known games.

LUFTRAUSERS
Shared: Indie · Action · Bullet Hell

ZeroRanger
Shared: Indie · Shoot 'Em Up · Action

Ikaruga
Shared: Shoot 'Em Up · Action · Bullet Hell

Star Saviors
Shared: Action · Shoot 'Em Up · Indie

Hotline Miami
Shared: Action · Great Soundtrack · Indie

Vampire Survivors
Shared: Bullet Hell · Indie · Pixel Graphics

Bit Blaster XL
Shared: Shoot 'Em Up · Bullet Hell · Action

Revolution Ace
Shared: Action · Shoot 'Em Up · Indie

Exit the Gungeon
Shared: Indie · Action · Arcade

Jet Lancer
Shared: Action · Indie · Shoot 'Em Up

Touhou Kouryudou ~ Unconnected Marketeers.
Shared: Action · Shoot 'Em Up · Bullet Hell

DRAINUS
Shared: Action · Indie · Shoot 'Em Up

UBERMOSH
Shared: Action · Indie · Great Soundtrack

Nex Machina
Shared: Action · Bullet Hell · Indie

BALL x PIT
Shared: Action · Bullet Hell · Shoot 'Em Up

Hotline Miami 2: Wrong Number
Shared: Great Soundtrack · Action · Pixel Graphics

Project Wingman
Shared: Action · Indie · Great Soundtrack

BLUE REVOLVER
Shared: Shoot 'Em Up · Indie · Action

Savant - Ascent
Shared: Action · Indie · Great Soundtrack

Planes, Bullets and Vodka
Shared: Action · Shoot 'Em Up · Bullet Hell

Nova Drift
Shared: Shoot 'Em Up · Bullet Hell · Arcade

Black Mesa
Shared: Action · Sci-fi · Shooter

Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Shoot 'Em Up · Bullet Hell · Action

Katana ZERO
Shared: Action · Great Soundtrack · Indie