Games like Duck Defender
Games like Duck Defender include Balatro, Vampire Survivors, Megabonk, BALL x PIT, and Slay the Spire 2. We matched them by the tags players give Duck Defender on Steam (Action, Strategy, Card Game, Roguelike, and Shooter): closest matches first, and among equally close ones the better-known games.

Balatro
Shared: Card Game · Roguelike · Strategy

Vampire Survivors
Shared: Bullet Hell · Roguelite · Roguelike

Megabonk
Shared: Roguelike · Action · Roguelite

BALL x PIT
Shared: Action · Roguelike · Roguelite

Slay the Spire 2
Shared: Card Game · Roguelike · Strategy

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

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

Nuclear Throne
Shared: Roguelike · Action · Bullet Hell

Slay the Spire
Shared: Card Game · Roguelike · Strategy

Star of Providence
Shared: Bullet Hell · Action · Roguelite

Enter the Gungeon
Shared: Roguelike · Bullet Hell · Pixel Graphics

Nova Drift
Shared: Bullet Hell · Shoot 'Em Up · Roguelite

Halls of Torment
Shared: Bullet Hell · Roguelite · Action

Loop Hero
Shared: Roguelike · Roguelite · Card Game

Pass the Fear
Shared: Strategy · Roguelite · Action

20 Minutes Till Dawn
Shared: Bullet Hell · Roguelite · Shoot 'Em Up

Cluckmech Oasis
Shared: Strategy · Roguelike · Action

Noobs Want to Live
Shared: Action · Roguelike · Bullet Hell

Everything is Crab: The Animal Evolution Roguelite
Shared: Strategy · Roguelite · Action

Death Must Die
Shared: Bullet Hell · Action · Roguelite

Atomicrops
Shared: Action · Roguelike · Bullet Hell

Planes, Bullets and Vodka
Shared: Action · Bullet Hell · Shoot 'Em Up

Gunfire Reborn
Shared: Roguelike · Roguelite · Action

Dungreed
Shared: Action · Roguelike · Roguelite