Games like Symphorix
Games like Symphorix include SYNTHETIK: Legion Rising, Nuclear Throne, Enter the Gungeon, Deep Rock Galactic: Survivor, and Vampire Survivors. We matched them by the tags players give Symphorix on Steam (Action Roguelike, Bullet Hell, Top-Down Shooter, Twin Stick Shooter, and Roguelite): closest matches first, and among equally close ones the better-known games.

SYNTHETIK: Legion Rising
Shared: Top-Down Shooter · Action Roguelike · Roguelite

Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Difficult

Enter the Gungeon
Shared: Action Roguelike · Bullet Hell · Difficult

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

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

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

Tiny Rogues
Shared: Action Roguelike · Bullet Hell · Top-Down Shooter

Voidigo
Shared: Action Roguelike · Twin Stick Shooter · Bullet Hell

Megabonk
Shared: Action Roguelike · Bullet Hell · Roguelite

BALL x PIT
Shared: Bullet Hell · Roguelite · Action Roguelike

Hades
Shared: Action Roguelike · Roguelite · Indie

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

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

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

Glyphica: Typing Survival
Shared: Action Roguelike · Bullet Hell · Top-Down Shooter

Star of Providence
Shared: Bullet Hell · Action Roguelike · Roguelite

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

SYNTHETIK 2
Shared: Action Roguelike · Top-Down Shooter · Roguelite

Brigador: Up-Armored Edition
Shared: Twin Stick Shooter · Top-Down Shooter · Difficult

Brotato
Shared: Bullet Hell · Action Roguelike · Roguelite

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

Relic Hunters Zero: Remix
Shared: Twin Stick Shooter · Action Roguelike · Top-Down Shooter

Magicraft
Shared: Action Roguelike · Bullet Hell · Roguelite

Pathogenic
Shared: Bullet Hell · Top-Down Shooter · Action Roguelike