Games like Arcadium - Space Odyssey
Games like Arcadium - Space Odyssey include Vampire Survivors, Megabonk, Deep Rock Galactic: Survivor, Rogue: Genesia, and Halls of Torment. We matched them by the tags players give Arcadium - Space Odyssey on Steam (Bullet Heaven, Roguelite, Action Roguelike, Procedural Generation, and Twin Stick Shooter): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Roguelite · Bullet Hell

Megabonk
Shared: Bullet Heaven · Action Roguelike · Roguelite

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

Rogue: Genesia
Shared: Bullet Heaven · Action Roguelike · Roguelite

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

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

Nova Drift
Shared: Roguelite · Action Roguelike · Bullet Hell

Soulstone Survivors
Shared: Bullet Heaven · Roguelite · Action Roguelike

Brotato
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Boneraiser Minions
Shared: Action Roguelike · Roguelite · Bullet Heaven

BALL x PIT
Shared: Roguelite · Action Roguelike · Arcade

Time Wasters
Shared: Bullet Heaven · Action Roguelike · Roguelite

Yet Another Zombie Survivors
Shared: Bullet Heaven · Action Roguelike · Roguelite

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

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

Atomicrops
Shared: Action Roguelike · Roguelite · Bullet Hell

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

The Spell Brigade
Shared: Bullet Heaven · Roguelite · Action Roguelike

Tower of Babel: Survivors of Chaos
Shared: Bullet Heaven · Action Roguelike · Roguelite

Karate Survivor
Shared: Bullet Heaven · Action Roguelike · Roguelite

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

Picayune Dreams
Shared: Bullet Heaven · Action Roguelike · Bullet Hell

Neon Abyss
Shared: Bullet Heaven · Procedural Generation · Roguelite

Temtem: Swarm
Shared: Bullet Heaven · Action Roguelike · Roguelite