Games like Cx6
Games like Cx6 include Vampire Survivors, LUFTRAUSERS, Planes, Bullets and Vodka, Megabonk, and Windowkill. We matched them by the tags players give Cx6 on Steam (Action, Bullet Hell, Arcade, Retro, and Minimalist): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Pixel Graphics · Singleplayer

LUFTRAUSERS
Shared: Bullet Hell · Action · Arcade

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

Megabonk
Shared: Bullet Hell · Action · Indie

Windowkill
Shared: Action · Bullet Hell · Arcade

Exit the Gungeon
Shared: Action · Arcade · Bullet Hell

Bit Blaster XL
Shared: Bullet Hell · Arcade · Action

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

BALL x PIT
Shared: Action · Arcade · Bullet Hell

Shovel Knight: Treasure Trove
Shared: Retro · Action · Pixel Graphics

Boneraiser Minions
Shared: Bullet Hell · Pixel Graphics · Action

UFO 50
Shared: Action · Retro · Arcade

UBERMOSH Vol.5
Shared: Action · Arcade · Retro

UBERMOSH
Shared: Action · Arcade · Pixel Graphics

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

Super Hexagon
Shared: Arcade · Action · Indie

ZeroRanger
Shared: Bullet Hell · Action · Arcade

Halls of Torment
Shared: Bullet Hell · Action · Pixel Graphics

Timberman
Shared: Action · Arcade · Pixel Graphics

UBERMOSH Vol.3
Shared: Action · Arcade · Bullet Hell

Hotline Miami
Shared: Action · Pixel Graphics · Retro

SANABI
Shared: Action · Pixel Graphics · Singleplayer

Sky Force Reloaded
Shared: Bullet Hell · Arcade · Action

Broken Armor
Shared: Action · Retro · Arcade