Games like Orbit Blade
Games like Orbit Blade include Vampire Survivors, Halls of Torment, BALL x PIT, Megabonk, and Enter the Gungeon. We matched them by the tags players give Orbit Blade on Steam (Action, Action Roguelike, Bullet Hell, Roguelite, and 2D): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

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

BALL x PIT
Shared: Action · Roguelite · Bullet Hell

Megabonk
Shared: Action Roguelike · Roguelite · Bullet Hell

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

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

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

Nuclear Throne
Shared: Action Roguelike · Action · Bullet Hell

20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Roguelite

UnderMine
Shared: Action Roguelike · Roguelite · Action

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

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

Dungreed
Shared: Action Roguelike · Action · Roguelite

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Roguelite

Rocket Rats
Shared: Action Roguelike · Bullet Hell · Roguelite

Atomicrops
Shared: Action · Bullet Hell · Action Roguelike

Sephiria
Shared: Action Roguelike · Roguelite · Action

I Am Legion: Stand Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

Hades
Shared: Action Roguelike · Roguelite · Action

Cultivation Story: Reincarnation
Shared: Action Roguelike · Action · Bullet Hell

Heroes of Hammerwatch
Shared: Action Roguelike · Roguelite · Pixel Graphics

Brotato
Shared: Bullet Hell · Action Roguelike · Roguelite

Hero Siege
Shared: Action Roguelike · Pixel Graphics · Action

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