Games like Operation Zeta
Games like Operation Zeta include Vampire Survivors, Dead Cells, Skul: The Hero Slayer, The Binding of Isaac: Rebirth, and Megabonk. We matched them by the tags players give Operation Zeta on Steam (Pixel Graphics, Roguelite, Action Roguelike, Sci-fi, and Indie): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Roguelite · Pixel Graphics

Dead Cells
Shared: Pixel Graphics · Action Roguelike · Roguelite

Skul: The Hero Slayer
Shared: Pixel Graphics · Action Roguelike · Indie

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

Megabonk
Shared: Action Roguelike · Roguelite · Indie

UnderMine
Shared: Roguelite · Pixel Graphics · Action Roguelike

Dungreed
Shared: Pixel Graphics · Action Roguelike · Roguelite

Streets of Rogue
Shared: Roguelite · Pixel Graphics · Action Roguelike

Death Must Die
Shared: Action Roguelike · Roguelite · Pixel Graphics

Hades
Shared: Roguelite · Action Roguelike · Indie

Enter the Gungeon
Shared: Action Roguelike · Pixel Graphics · Indie

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

FTL: Faster Than Light
Shared: Sci-fi · Space · Indie

ScourgeBringer
Shared: Roguelite · Pixel Graphics · Indie

Moonlighter
Shared: Pixel Graphics · Roguelite · Action Roguelike

Halls of Torment
Shared: Roguelite · Action Roguelike · Pixel Graphics

Wizard of Legend
Shared: Pixel Graphics · Action Roguelike · Roguelite

Neon Abyss
Shared: Pixel Graphics · Procedural Generation · Roguelike

Nuclear Throne
Shared: Pixel Graphics · Action Roguelike · Indie

Noita
Shared: Pixel Graphics · Indie · Roguelike

Rogue Legacy
Shared: Action Roguelike · Indie · Roguelite

Realm of the Mad God Exalt
Shared: Pixel Graphics · Action Roguelike · Roguelite

Sephiria
Shared: Roguelite · Action Roguelike · Pixel Graphics

Risk of Rain (2013)
Shared: Action Roguelike · Pixel Graphics · Indie