Games like Pleiades Zero
Games like Pleiades Zero include Nordic Ashes: Survivors of Ragnarok, Vampire Survivors, Starfield, Elite Dangerous, and Thank Goodness You're Here!. We matched them by the tags players give Pleiades Zero on Steam (Action Roguelike, Casual, Exploration, 2D Platformer, and Space Sim): closest matches first, and among equally close ones the better-known games.

Nordic Ashes: Survivors of Ragnarok
Shared: Action Roguelike · Exploration · Action RPG

Vampire Survivors
Shared: Action Roguelike · 2D · Casual

Starfield
Shared: Exploration · Space · Sci-fi

Elite Dangerous
Shared: Space Sim · Exploration · Space

Thank Goodness You're Here!
Shared: Exploration · Casual · Adventure

DAVE THE DIVER
Shared: Casual · Exploration · Adventure

Cosmoteer: Starship Architect & Commander
Shared: 2D · Exploration · Space Sim

Hero Siege
Shared: Action Roguelike · Action RPG · RPG

EVE Online
Shared: Exploration · Space Sim · Adventure

Starcom: Unknown Space
Shared: Exploration · Space Sim · Action RPG

Death Must Die
Shared: Action Roguelike · 2D · Casual

No Man's Sky
Shared: Exploration · Adventure · Space

Starcom: Nexus
Shared: Exploration · Adventure · Space Sim

Hogwarts Legacy
Shared: Exploration · Adventure · Fantasy

Anomaly Agent
Shared: Action Roguelike · 2D Platformer · Action RPG

The Elder Scrolls IV: Oblivion Remastered
Shared: Exploration · Adventure · Fantasy

Gothic 1 Remake
Shared: Exploration · Adventure · Action RPG

Heroes of Hammerwatch II
Shared: Action Roguelike · Action RPG · Adventure

Slime Rancher
Shared: Exploration · Adventure · Casual

Melvor Idle
Shared: Casual · 2D · Adventure

Exo One
Shared: Exploration · Adventure · Space Sim

Chinese Online Game
Shared: Action Roguelike · 2D Platformer · Action RPG

Drova - Forsaken Kin
Shared: Exploration · Action RPG · 2D

Cat Quest II
Shared: Exploration · Action RPG · Adventure