Games like Deckbound
Games like Deckbound include Enter the Gungeon, Vampire Survivors, Death Must Die, Tiny Rogues, and Halls of Torment. We matched them by the tags players give Deckbound on Steam (Action Roguelike, RPG, Bullet Hell, Top-Down Shooter, and Dungeon Crawler): closest matches first, and among equally close ones the better-known games.

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

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

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

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

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

Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Roguelike

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Roguelike · Dungeon Crawler

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

Hand of Fate 2
Shared: RPG · Roguelike Deckbuilder · Action Roguelike

Hand of Fate
Shared: Action Roguelike · Roguelike Deckbuilder · RPG

UnderMine
Shared: Action Roguelike · RPG · Dungeon Crawler

Heroes of Hammerwatch II
Shared: Action Roguelike · RPG · Dungeon Crawler

Magicraft
Shared: Action Roguelike · Bullet Hell · RPG

Slay the Spire
Shared: Roguelike Deckbuilder · Card Game · Roguelike

Hero Siege
Shared: Action Roguelike · RPG · Roguelike

Hades
Shared: Action Roguelike · Action · RPG

Dungreed
Shared: Action Roguelike · Action · Roguelike

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

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

Hades II
Shared: Action Roguelike · Action · RPG

Brotato
Shared: Action Roguelike · Bullet Hell · Roguelike

Cultivation Story: Reincarnation
Shared: Action Roguelike · RPG · Bullet Hell

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

Vampire Crawlers: The Turbo Wildcard from Vampire Survivors
Shared: Dungeon Crawler · Roguelike · Action