Games like Backyard Bayou
Games like Backyard Bayou include Megabonk, Vampire Survivors, Risk of Rain 2, Crab Champions, and Halls of Torment. We matched them by the tags players give Backyard Bayou on Steam (Action Roguelike, Bullet Hell, Third-Person Shooter, Roguelite, and PvE): closest matches first, and among equally close ones the better-known games.

Megabonk
Shared: Action Roguelike · Roguelite · Bullet Hell

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

Risk of Rain 2
Shared: Action Roguelike · Third-Person Shooter · Roguelite

Crab Champions
Shared: Action Roguelike · Third-Person Shooter · Arcade

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

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

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

Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

Hades
Shared: Action Roguelike · Roguelite · Action

LORT
Shared: Action Roguelike · Third-Person Shooter · Roguelite

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

Brotato
Shared: Bullet Hell · Action Roguelike · Roguelike

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

20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Roguelite

The Spell Brigade
Shared: Bullet Hell · Roguelite · Action Roguelike

Nova Drift
Shared: Bullet Hell · Action Roguelike · Roguelite

Hades II
Shared: Roguelite · Action Roguelike · Action

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

Magicraft
Shared: Action Roguelike · Bullet Hell · Roguelite

Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Roguelike

Returnal™
Shared: Bullet Hell · Action · Third-Person Shooter

Vellum
Shared: Action Roguelike · Third-Person Shooter · Roguelite

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

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