Games like Iridion II
Games like Iridion II include Star Saviors, Ikaruga, ZeroRanger, Bit Blaster XL, and METAL SLUG 3. We matched them by the tags players give Iridion II on Steam (Action, Shoot 'Em Up, Retro, Space, and Arcade): closest matches first, and among equally close ones the better-known games.

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

Ikaruga
Shared: Shoot 'Em Up · Action · Arcade

ZeroRanger
Shared: Shoot 'Em Up · Action · Great Soundtrack

Bit Blaster XL
Shared: Shoot 'Em Up · Action · Arcade

METAL SLUG 3
Shared: Action · Arcade · Retro

ARCADE GAME SERIES: GALAGA
Shared: Action · Shoot 'Em Up · Arcade

Ex-Zodiac
Shared: Shoot 'Em Up · Arcade · Action

METAL SLUG X
Shared: Action · Arcade · Shoot 'Em Up

TEKKEN 7
Shared: Action · Arcade · Controller

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

Cyberhunt
Shared: Action · Shoot 'Em Up · Arcade

Super Galaxy Squadron EX Turbo
Shared: Shoot 'Em Up · Action · Retro

PAC-MAN™ Championship Edition DX+
Shared: Retro · Action · Arcade

DARIUSBURST Chronicle Saviours
Shared: Shoot 'Em Up · Action · Arcade

Blast-off
Shared: Action · Shoot 'Em Up · Space

METAL SLUG
Shared: Action · Arcade · Shoot 'Em Up

LUFTRAUSERS
Shared: Action · Arcade · Shoot 'Em Up

Nova Drift
Shared: Shoot 'Em Up · Arcade · Action

UBERMOSH
Shared: Action · Great Soundtrack · Arcade

Mass Effect (2007)
Shared: Action · Space · Sci-fi

Geometry Wars™ 3: Dimensions Evolved
Shared: Action · Shoot 'Em Up · Arcade

HELLDIVERS™ 2
Shared: Action · Sci-fi · Space

Call of Duty®: Infinite Warfare
Shared: Action · Space · Futuristic

Hotline Miami
Shared: Action · Great Soundtrack · Retro