Games like Defy The Abyss
Games like Defy The Abyss include Rogue: Genesia, Megabonk, Vampire Survivors, Halls of Torment, and BALL x PIT. We matched them by the tags players give Defy The Abyss on Steam (Bullet Heaven, Roguelike, Twin Stick Shooter, Bullet Hell, and Supernatural): closest matches first, and among equally close ones the better-known games.

Rogue: Genesia
Shared: Bullet Heaven · Bullet Hell · Twin Stick Shooter

Megabonk
Shared: Bullet Heaven · Roguelike · Bullet Hell

Vampire Survivors
Shared: Bullet Hell · Roguelike · Arcade

Halls of Torment
Shared: Bullet Hell · Roguelike · Bullet Heaven

BALL x PIT
Shared: Roguelike · Bullet Hell · Arcade

Brotato
Shared: Roguelike · Bullet Hell · Bullet Heaven

Soulstone Survivors
Shared: Bullet Heaven · Bullet Hell · Roguelike

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

Enter the Gungeon
Shared: Roguelike · Bullet Hell · Twin Stick Shooter

Deep Rock Galactic: Survivor
Shared: Bullet Heaven · Bullet Hell · PvE

Atomicrops
Shared: Roguelike · Bullet Hell · Action

Neon Abyss
Shared: Roguelike · Bullet Heaven · Bullet Hell

Boneraiser Minions
Shared: Bullet Hell · Bullet Heaven · 2D

Time Wasters
Shared: Bullet Heaven · Twin Stick Shooter · Bullet Hell

Tower of Babel: Survivors of Chaos
Shared: Bullet Heaven · Bullet Hell · Roguelike

Nova Drift
Shared: Bullet Hell · Bullet Heaven · Arcade

The Spell Brigade
Shared: Bullet Heaven · Bullet Hell · Roguelike

Karate Survivor
Shared: Bullet Heaven · Bullet Hell · Roguelike

Temtem: Swarm
Shared: Bullet Heaven · Twin Stick Shooter · Roguelike

Astro Prospector
Shared: Roguelike · Bullet Heaven · Bullet Hell

Pathogenic
Shared: Roguelike · Bullet Hell · Bullet Heaven

Project Lazarus
Shared: Bullet Heaven · Bullet Hell · Action

Dead Estate
Shared: Roguelike · Twin Stick Shooter · Bullet Hell

Bloody Hell
Shared: Bullet Hell · Twin Stick Shooter · Demons