Games like Eigen Space
Games like Eigen Space include Risk of Rain 2, Crab Champions, Megabonk, LORT, and Hades. We matched them by the tags players give Eigen Space on Steam (Action Roguelike, Runner, Third-Person Shooter, Shooter, and Roguelike): closest matches first, and among equally close ones the better-known games.

Risk of Rain 2
Shared: Action Roguelike · Third-Person Shooter · Roguelike

Crab Champions
Shared: Action Roguelike · Roguelike · Third-Person Shooter

Megabonk
Shared: Action Roguelike · Roguelike · Indie

LORT
Shared: Action Roguelike · Third-Person Shooter · Roguelike

Hades
Shared: Action Roguelike · Roguelike · Indie

PUBG: BATTLEGROUNDS
Shared: Shooter · Third-Person Shooter · Action

Max Payne 3
Shared: Third-Person Shooter · Shooter · Action

The Callisto Protocol™
Shared: Third-Person Shooter · Shooter · Third Person

HELLDIVERS™ 2
Shared: Third-Person Shooter · Shooter · Action

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

Warframe
Shared: Third-Person Shooter · Third Person · Character Customization

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

暖雪 Warm Snow
Shared: Action Roguelike · Roguelike · Character Customization

Marvel Rivals
Shared: Third-Person Shooter · Shooter · 3D

Grand Theft Auto V Legacy
Shared: Shooter · Third Person · Third-Person Shooter

Vampire Survivors
Shared: Action Roguelike · Roguelike · Indie

Enter the Gungeon
Shared: Action Roguelike · Roguelike · Indie

Sword Art Online: Fatal Bullet
Shared: Character Customization · Third-Person Shooter · Shooter

Endless Alice
Shared: Action Roguelike · Third-Person Shooter · Shooter

Vellum
Shared: Action Roguelike · Third-Person Shooter · 3D

Terminull Brigade™
Shared: Action Roguelike · Third-Person Shooter · Shooter

Aliens: Fireteam Elite
Shared: Shooter · Third-Person Shooter · Character Customization

The First Descendant
Shared: Third-Person Shooter · Shooter · Character Customization

Nuclear Throne
Shared: Action Roguelike · Roguelike · Shooter