Games like Split Personality Doctor
Games like Split Personality Doctor include Vampire Survivors, Skul: The Hero Slayer, Enter the Gungeon, Halls of Torment, and Death Must Die. We matched them by the tags players give Split Personality Doctor on Steam (Action, Action Roguelike, Roguelike, Combat, and 2D): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · 2D · Bullet Hell

Skul: The Hero Slayer
Shared: Action · Action Roguelike · Roguelike

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

Halls of Torment
Shared: Action Roguelike · Roguelike · Action

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

Megabonk
Shared: Action Roguelike · Roguelike · Action

Hades
Shared: Action Roguelike · Action · Roguelike

Sephiria
Shared: Action Roguelike · Roguelike · Action

Rogue Legacy
Shared: Roguelike · Action Roguelike · Action

BALL x PIT
Shared: Action · Roguelike · Action Roguelike

Brotato
Shared: Roguelike · Action Roguelike · Bullet Hell

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

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Roguelike · 2D

Hades II
Shared: Action · Roguelike · Action Roguelike

Noobs Want to Live
Shared: Roguelike · Action · Action Roguelike

Dungreed
Shared: Action Roguelike · Roguelike · Action

Have a Nice Death
Shared: Action Roguelike · Action · 2D

Nuclear Throne
Shared: Action Roguelike · Roguelike · Action

Cultivation Story: Reincarnation
Shared: Action Roguelike · Action · Roguelike

Hero Siege
Shared: Action Roguelike · Roguelike · RPG

暖雪 Warm Snow
Shared: Action Roguelike · Roguelike · 2D

Risk of Rain (2013)
Shared: Action Roguelike · Roguelike · Action

Dead Cells
Shared: Roguelike · Action Roguelike · 2D

Rabbit and Steel
Shared: Action Roguelike · Roguelike · Bullet Hell