Games like Schism
Games like Schism include The Binding of Isaac: Rebirth, Tiny Rogues, Enter the Gungeon, Hades, and The Binding of Isaac. We matched them by the tags players give Schism on Steam (Action Roguelike, RPG, Gun Customization, Bullet Hell, and Replay Value): closest matches first, and among equally close ones the better-known games.

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Replay Value · Roguelike

Tiny Rogues
Shared: Action Roguelike · Bullet Hell · Replay Value

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

Hades
Shared: Action Roguelike · Roguelike · RPG

The Binding of Isaac
Shared: Action Roguelike · Replay Value · Roguelike

Brotato
Shared: Action Roguelike · Bullet Hell · Roguelike

Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Roguelike

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelike

Noita
Shared: Roguelike · Dungeon Crawler · Difficult

Dead Estate
Shared: Action Roguelike · Bullet Hell · Roguelike

Magicraft
Shared: Action Roguelike · Bullet Hell · RPG

Pathogenic
Shared: Bullet Hell · Action Roguelike · Roguelike

Hades II
Shared: Action Roguelike · RPG · Roguelike

SULFUR
Shared: Action Roguelike · Gun Customization · Dungeon Crawler

Realm of the Mad God Exalt
Shared: Bullet Hell · Action Roguelike · Roguelike

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

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

20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Top-Down Shooter

Star of Providence
Shared: Action Roguelike · Bullet Hell · Shoot 'Em Up

Gunfire Reborn
Shared: Roguelike · Action Roguelike · Looter Shooter

Dungreed
Shared: Action Roguelike · Roguelike · Dungeon Crawler

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

Megabonk
Shared: Action Roguelike · Bullet Hell · Roguelike

Risk of Rain 2
Shared: Action Roguelike · Roguelike · Looter Shooter