Games like Slasher: Origins
Games like Slasher: Origins include Vampire Survivors, Halls of Torment, Soulstone Survivors, Death Must Die, and Megabonk. We matched them by the tags players give Slasher: Origins on Steam (Bullet Heaven, Action Roguelike, Arcade, Roguelite, and Dark Fantasy): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Roguelite · Indie

Halls of Torment
Shared: Action Roguelike · Roguelite · Dark Fantasy

Soulstone Survivors
Shared: Bullet Heaven · Action Roguelike · Roguelite

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

Megabonk
Shared: Bullet Heaven · Action Roguelike · Roguelite

Yet Another Zombie Survivors
Shared: Bullet Heaven · Action Roguelike · Roguelite

Brotato
Shared: Action Roguelike · Bullet Heaven · Roguelite

Boneraiser Minions
Shared: Action Roguelike · Roguelite · Bullet Heaven

Hades
Shared: Action Roguelike · Roguelite · Indie

Jotunnslayer: Hordes of Hel
Shared: Bullet Heaven · Action Roguelike · Roguelite

Nordic Ashes: Survivors of Ragnarok
Shared: Bullet Heaven · Action Roguelike · Roguelite

Nova Drift
Shared: Arcade · Roguelite · Action Roguelike

Spirit Hunters: Infinite Horde
Shared: Bullet Heaven · Action Roguelike · Roguelite

Tower of Babel: Survivors of Chaos
Shared: Bullet Heaven · Action Roguelike · Roguelite

BALL x PIT
Shared: Arcade · Roguelite · Action Roguelike

Rogue Legacy
Shared: Action Roguelike · Indie · Roguelite

The Spell Brigade
Shared: Bullet Heaven · Roguelite · Action Roguelike

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

Hades II
Shared: Roguelite · Action Roguelike · RPG

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

Conquest Dark
Shared: Bullet Heaven · Action Roguelike · Roguelite

Time Wasters
Shared: Bullet Heaven · Action Roguelike · Roguelite

Dead Cells
Shared: Action Roguelike · Roguelite · 2D

Rogue Legacy 2
Shared: Arcade · Roguelite · Indie