Games like HARSH.
Games like HARSH. include Vampire Survivors, Hades, Death Must Die, Halls of Torment, and Megabonk. We matched them by the tags players give HARSH. on Steam (Action Roguelike, Hack and Slash, Bullet Hell, Roguelite, and 2D): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

Hades
Shared: Action Roguelike · Hack and Slash · Roguelite

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

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

Megabonk
Shared: Action Roguelike · Roguelite · Bullet Hell

Magicraft
Shared: Action Roguelike · Bullet Hell · Roguelite

Skul: The Hero Slayer
Shared: Action Roguelike · 2D · Roguelite

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

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

Dead Cells
Shared: Action Roguelike · 2D · Roguelite

Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

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

The Binding of Isaac
Shared: Action Roguelike · Procedural Generation · Top-Down

Brotato
Shared: Action Roguelike · Bullet Hell · Roguelite

Hades II
Shared: Hack and Slash · Roguelite · Action Roguelike

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

Enter the Gungeon
Shared: Action Roguelike · Bullet Hell · 2D

Hero Siege
Shared: Hack and Slash · Action Roguelike · Top-Down

UnderMine
Shared: Action Roguelike · Roguelite · Action

Slime 3K: Rise Against Despot
Shared: Action Roguelike · Bullet Hell · Roguelite

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

Have a Nice Death
Shared: Action Roguelike · Hack and Slash · 2D

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Roguelite

Shape of Dreams
Shared: Action Roguelike · Hack and Slash · Roguelite