Games like Steinstern: Spacewar
Games like Steinstern: Spacewar include Sky Force Reloaded, Minishoot' Adventures, Brotato, Voidigo, and Killsquad. We matched them by the tags players give Steinstern: Spacewar on Steam (Local Co-Op, Bullet Hell, Top-Down Shooter, Procedural Generation, and Incremental): closest matches first, and among equally close ones the better-known games.

Sky Force Reloaded
Shared: Bullet Hell · Local Co-Op · Top-Down Shooter

Minishoot' Adventures
Shared: Bullet Hell · Twin Stick Shooter · Top-Down Shooter

Brotato
Shared: Bullet Hell · Local Co-Op · Top-Down Shooter

Voidigo
Shared: Local Co-Op · Bullet Hell · Twin Stick Shooter

Killsquad
Shared: Top-Down Shooter · Hack and Slash · Twin Stick Shooter

HELLDIVERS™ Dive Harder Edition
Shared: Top-Down Shooter · Local Co-Op · Twin Stick Shooter

Death Must Die
Shared: Bullet Hell · Hack and Slash · RPG

Pathogenic
Shared: Bullet Hell · Local Co-Op · Top-Down Shooter

Insect Swarm
Shared: Top-Down Shooter · Shoot 'Em Up · Hack and Slash

20 Minutes Till Dawn
Shared: Bullet Hell · Top-Down Shooter · Shoot 'Em Up

Hero Siege
Shared: Hack and Slash · Action RPG · Local Co-Op

Furi
Shared: Bullet Hell · Hack and Slash · Shoot 'Em Up

Enter the Gungeon
Shared: Bullet Hell · Local Co-Op · Twin Stick Shooter

Nex Machina
Shared: Bullet Hell · Twin Stick Shooter · Local Co-Op

Darksiders Genesis
Shared: Local Co-Op · Hack and Slash · Action

Vampire Survivors
Shared: Bullet Hell · Local Co-Op · Casual

BALL x PIT
Shared: Bullet Hell · Top-Down Shooter · Shoot 'Em Up

Deep Rock Galactic: Survivor
Shared: Bullet Hell · Top-Down Shooter · Procedural Generation

Pesticide Not Required
Shared: Bullet Hell · Top-Down Shooter · Shoot 'Em Up

Greedland
Shared: Bullet Hell · Shoot 'Em Up · Twin Stick Shooter

Army of Ruin
Shared: Bullet Hell · Top-Down Shooter · Hack and Slash

Relic Hunters Zero: Remix
Shared: Top-Down Shooter · Twin Stick Shooter · Bullet Hell

Beat Hazard 2
Shared: Procedural Generation · Top-Down Shooter · Bullet Hell

Renegade Ops
Shared: Local Co-Op · Twin Stick Shooter · Shoot 'Em Up