Games like Hollow Orbit
Games like Hollow Orbit include Deep Rock Galactic: Survivor, Enter the Gungeon, SYNTHETIK: Legion Rising, Vampire Survivors, and Nuclear Throne. We matched them by the tags players give Hollow Orbit on Steam (Action Roguelike, Twin Stick Shooter, Top-Down Shooter, Extraction Shooter, and Bullet Hell): closest matches first, and among equally close ones the better-known games.

Deep Rock Galactic: Survivor
Shared: Action Roguelike · Top-Down Shooter · Bullet Hell

Enter the Gungeon
Shared: Action Roguelike · Bullet Hell · Twin Stick Shooter

SYNTHETIK: Legion Rising
Shared: Top-Down Shooter · Action Roguelike · Roguelite

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Top-Down Shooter

Rogue: Genesia
Shared: Action Roguelike · Bullet Hell · Twin Stick Shooter

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

Tiny Rogues
Shared: Action Roguelike · Top-Down Shooter · Bullet Hell

SYNTHETIK 2
Shared: Action Roguelike · Top-Down Shooter · Twin Stick Shooter

The Binding of Isaac
Shared: Action Roguelike · Procedural Generation · Difficult

Voidigo
Shared: Action Roguelike · Twin Stick Shooter · Bullet Hell

20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Top-Down Shooter

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

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

Hades
Shared: Action Roguelike · Roguelite · Action

Brigador: Up-Armored Edition
Shared: Twin Stick Shooter · Top-Down Shooter · Action

Megabonk
Shared: Action Roguelike · Roguelite · Bullet Hell

Star of Providence
Shared: Action Roguelike · Bullet Hell · Roguelite

Glyphica: Typing Survival
Shared: Action Roguelike · Top-Down Shooter · Bullet Hell

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

Pathogenic
Shared: Top-Down Shooter · Bullet Hell · Action Roguelike

Relic Hunters Zero: Remix
Shared: Twin Stick Shooter · Action Roguelike · Top-Down Shooter

Magicraft
Shared: Action Roguelike · Bullet Hell · Roguelite

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