Games like Cluster Fly
Games like Cluster Fly include Vampire Survivors, Windowkill, Super Hexagon, Bit Blaster XL, and LUFTRAUSERS. We matched them by the tags players give Cluster Fly on Steam (Action, Arcade, Bullet Hell, Collectathon, and Indie): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Indie · 2D

Windowkill
Shared: Action · Bullet Hell · Arcade

Super Hexagon
Shared: Arcade · Indie · Action

Bit Blaster XL
Shared: Bullet Hell · Arcade · Action

LUFTRAUSERS
Shared: Arcade · Bullet Hell · Action

Exit the Gungeon
Shared: Arcade · Action · Indie

BALL x PIT
Shared: Action · Arcade · Bullet Hell

A Dance of Fire and Ice
Shared: Arcade · Indie · 2D

Rogue Legacy 2
Shared: Arcade · Action · Indie

Orbt XL
Shared: Arcade · Action · 2D

Sky Force Reloaded
Shared: Arcade · Bullet Hell · Action

Nova Drift
Shared: Bullet Hell · Arcade · Action

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

Savant - Ascent
Shared: Action · Indie · Bullet Hell

Megabonk
Shared: Bullet Hell · Indie · Action

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

Streets of Rage 4
Shared: Action · Indie · Arcade

Timberman
Shared: Action · Indie · Arcade

Enter the Gungeon
Shared: Bullet Hell · Indie · Action

Just Shapes & Beats
Shared: Bullet Hell · Action · Indie

Geometry Dash
Shared: 2D · Indie · Difficult

ZeroRanger
Shared: Bullet Hell · Action · Indie

Skul: The Hero Slayer
Shared: Action · Indie · 2D

Star Saviors
Shared: Action · Bullet Hell · Indie