Games like Orbital Arena
Games like Orbital Arena include Vampire Survivors, BALL x PIT, Enter the Gungeon, Halls of Torment, and Megabonk. We matched them by the tags players give Orbital Arena on Steam (Action Roguelike, Bullet Hell, PvE, Action, and Arcade): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · 2D

BALL x PIT
Shared: Action · Bullet Hell · Action Roguelike

Enter the Gungeon
Shared: Action Roguelike · Bullet Hell · Roguelike

Halls of Torment
Shared: Action Roguelike · Bullet Hell · Roguelike

Megabonk
Shared: Action Roguelike · Bullet Hell · Roguelike

Skul: The Hero Slayer
Shared: Action Roguelike · Action · Roguelike

Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Roguelike

Rogue: Genesia
Shared: Bullet Hell · Action Roguelike · Arcade

Risk of Rain Returns
Shared: Action Roguelike · PvE · 2D

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Roguelike · Indie

Death Must Die
Shared: Action Roguelike · Bullet Hell · Action

Brotato
Shared: Bullet Hell · Action Roguelike · Roguelike

Deep Rock Galactic: Survivor
Shared: Action Roguelike · Bullet Hell · PvE

Rogue Legacy
Shared: Action Roguelike · Roguelike · Action

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · 2D

The Binding of Isaac
Shared: Action Roguelike · Roguelike · Action

Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · Roguelike

Dungreed
Shared: Action Roguelike · Action · Roguelike

Windowkill
Shared: Action Roguelike · Action · Bullet Hell

Crab Champions
Shared: Action Roguelike · Arcade · Roguelike

Hero Siege
Shared: Action Roguelike · Roguelike · Pixel Graphics

Noobs Want to Live
Shared: Bullet Hell · Action Roguelike · Action

Dead Cells
Shared: Action Roguelike · Roguelike · 2D

Hades
Shared: Action Roguelike · Action · Roguelike