Games like Overclocked Arena: Instability Protocol
Games like Overclocked Arena: Instability Protocol include Vampire Survivors, Brotato, Megabonk, Deep Rock Galactic: Survivor, and BALL x PIT. We matched them by the tags players give Overclocked Arena: Instability Protocol on Steam (Bullet Hell, Action Roguelike, Roguelite, Action, and Survival): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Action Roguelike · Roguelite

Brotato
Shared: Bullet Hell · Action Roguelike · Survival

Megabonk
Shared: Action Roguelike · Roguelite · Bullet Hell

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

BALL x PIT
Shared: Roguelite · Bullet Hell · Action

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

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

Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Action

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

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

FatalZone
Shared: Bullet Hell · Action Roguelike · Roguelite

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

Magicraft
Shared: Action Roguelike · Bullet Hell · Roguelite

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

Hades
Shared: Action Roguelike · Roguelite · Action

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

Tiny Rogues
Shared: Bullet Hell · Action Roguelike · Roguelite

Nova Drift
Shared: Bullet Hell · Roguelite · Action Roguelike

Arms of God
Shared: Action Roguelike · Bullet Hell · Roguelite

Atomicrops
Shared: Bullet Hell · Action · Action Roguelike

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Roguelike · Pixel Graphics

Nordic Ashes: Survivors of Ragnarok
Shared: Action Roguelike · Bullet Hell · Roguelite

God Of Weapons
Shared: Action Roguelike · Roguelite · Bullet Hell

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