Games like Blood Aliens 3
Games like Blood Aliens 3 include Bit Blaster XL, Nova Drift, DRAINUS, Zombotron, and Star Saviors. We matched them by the tags players give Blood Aliens 3 on Steam (Side Scroller, Bullet Hell, Shoot 'Em Up, Shooter, and Action-Adventure): closest matches first, and among equally close ones the better-known games.

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

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

DRAINUS
Shared: Shoot 'Em Up · Shooter · Action

Zombotron
Shared: 2D · Action · Shooter

Star Saviors
Shared: Bullet Hell · Shoot 'Em Up · Action

Huntdown
Shared: Side Scroller · Shooter · Shoot 'Em Up

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

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

Jets'n'Guns 2
Shared: Shoot 'Em Up · Side Scroller · Bullet Hell

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

Guns, Gore & Cannoli
Shared: Side Scroller · Action · 2D

Guns, Gore and Cannoli 2
Shared: Side Scroller · Action · 2D

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

DoDonPachi Resurrection
Shared: Bullet Hell · Shoot 'Em Up · Shooter

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

DARIUSBURST Chronicle Saviours
Shared: Shoot 'Em Up · Side Scroller · Bullet Hell

Marvel's Guardians of the Galaxy
Shared: Action-Adventure · Action · Choices Matter

Sine Mora
Shared: Shoot 'Em Up · Bullet Hell · Side Scroller

Beat Hazard
Shared: Bullet Hell · Shoot 'Em Up · 2D

Broforce
Shared: Action · 2D · Side Scroller

Revolution Ace
Shared: Shoot 'Em Up · Bullet Hell · Shooter

Intrusion 2
Shared: Action · Shooter · 2D

R-Type Final 2
Shared: Side Scroller · Shoot 'Em Up · Shooter

METAL SLUG
Shared: Side Scroller · Action · Shoot 'Em Up