Games like Breaching Harkon
Games like Breaching Harkon include Deep Rock Galactic: Survivor, Vampire Survivors, BALL x PIT, Rogue: Genesia, and Nova Drift. We matched them by the tags players give Breaching Harkon on Steam (Action Roguelike, Arena Shooter, Bullet Hell, Top-Down Shooter, and Twin Stick Shooter): closest matches first, and among equally close ones the better-known games.

Deep Rock Galactic: Survivor
Shared: Action Roguelike · Bullet Hell · Top-Down Shooter

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

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

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

Nova Drift
Shared: Bullet Hell · Action Roguelike · Arena Shooter

Brotato
Shared: Action Roguelike · Bullet Hell · Arena Shooter

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

Glyphica: Typing Survival
Shared: Action Roguelike · Arena Shooter · Bullet Hell

Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Roguelike

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

Time Wasters
Shared: Action Roguelike · Bullet Hell · Arena Shooter

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

SNKRX
Shared: Action Roguelike · Arena Shooter · Top-Down Shooter

X Invader
Shared: Arena Shooter · Action Roguelike · Bullet Hell

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

Megabonk
Shared: Action Roguelike · Bullet Hell · Roguelite

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

Blazing Beaks
Shared: Action Roguelike · Top-Down Shooter · Roguelite

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

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

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

Vital Shell
Shared: Action Roguelike · Bullet Hell · Roguelite

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

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