Games like Ranphon
Games like Ranphon include Bit Blaster XL, Vampire Survivors, Broforce, Huntdown, and Planes, Bullets and Vodka. We matched them by the tags players give Ranphon on Steam (Side Scroller, Space, Shooter, Spaceships, and Bullet Hell): closest matches first, and among equally close ones the better-known games.

Bit Blaster XL
Shared: Bullet Hell · Shooter · Arcade

Vampire Survivors
Shared: Bullet Hell · Pixel Graphics · Arcade

Broforce
Shared: Action · Side Scroller · Shooter

Huntdown
Shared: Side Scroller · Shooter · Action

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

LUFTRAUSERS
Shared: Bullet Hell · Arcade · Action

Megabonk
Shared: Bullet Hell · Action · Arcade

Nova Drift
Shared: Bullet Hell · Arcade · Shooter

METAL SLUG 3
Shared: Side Scroller · Arcade · Action

Jets'n'Guns Gold
Shared: Side Scroller · Bullet Hell · Action

Chorus
Shared: Space · Action · Spaceships

Exit the Gungeon
Shared: Arcade · Bullet Hell · Action

STAR WARS™ Battlefront™ II
Shared: Shooter · Space · Action

METAL SLUG
Shared: Side Scroller · Arcade · Action

Syder Arcade
Shared: Shooter · Bullet Hell · Arcade

DRAINUS
Shared: Shooter · Action · Side Scroller

Alex Jones: NWO Wars
Shared: Shooter · Side Scroller · Arcade

Blazing Chrome
Shared: Side Scroller · Action · Shooter

Star Saviors
Shared: Space · Bullet Hell · Action

ZeroRanger
Shared: Bullet Hell · Action · Arcade

Warhammer 40,000: Boltgun
Shared: Shooter · Action · Pixel Graphics

R-Type Final 2
Shared: Side Scroller · Shooter · Space

DARIUSBURST Chronicle Saviours
Shared: Side Scroller · Arcade · Action

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