Games like G-Darius HD
Games like G-Darius HD include Soda Crisis, R-Type Final 2, Huntdown, METAL SLUG, and METAL SLUG 3. We matched them by the tags players give G-Darius HD on Steam (Side Scroller, Shoot 'Em Up, Shooter, Arcade, and Female Protagonist): closest matches first, and among equally close ones the better-known games.

Soda Crisis
Shared: Side Scroller · Shoot 'Em Up · Shooter

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

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

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

METAL SLUG 3
Shared: Arcade · Side Scroller · Shooter

Contra: Operation Galuga
Shared: Shooter · Arcade · Shoot 'Em Up

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

Sine Mora EX
Shared: Side Scroller · Shoot 'Em Up · Arcade

Assault Android Cactus+
Shared: Shoot 'Em Up · Shooter · Female Protagonist

Alex Jones: NWO Wars
Shared: Shooter · Arcade · Shoot 'Em Up

DRAINUS
Shared: Shoot 'Em Up · Shooter · Action

Iron Meat
Shared: Side Scroller · Shooter · Arcade

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

METAL SLUG 2
Shared: Side Scroller · Arcade · Shoot 'Em Up

Sky Force Reloaded
Shared: Shoot 'Em Up · Arcade · Action

Rogue Stormers
Shared: Side Scroller · Shoot 'Em Up · Shooter

METAL SLUG X
Shared: Arcade · Shoot 'Em Up · Side Scroller

Kero Blaster
Shared: Side Scroller · Shoot 'Em Up · Shooter

Terminator 2D: NO FATE
Shared: Side Scroller · Arcade · Shooter

Guns, Gore and Cannoli 2
Shared: Side Scroller · Shooter · Shoot 'Em Up

Guns, Gore & Cannoli
Shared: Side Scroller · Shoot 'Em Up · Action

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

REVOLVER360 RE:ACTOR
Shared: Shoot 'Em Up · Shooter · Side Scroller

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