Games like Boom Buddies
Games like Boom Buddies include Vampire Survivors, Megabonk, Rocket Rats, Skul: The Hero Slayer, and Death Must Die. We matched them by the tags players give Boom Buddies on Steam (Casual, Action Roguelike, Action, Roguelite, and Bullet Hell): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Roguelite · Bullet Hell

Megabonk
Shared: Action Roguelike · Roguelite · Bullet Hell

Rocket Rats
Shared: Action Roguelike · Casual · Bullet Hell

Skul: The Hero Slayer
Shared: Action Roguelike · Action · Pixel Graphics

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

BALL x PIT
Shared: Action · Roguelite · Action Roguelike

Nuclear Throne
Shared: Action Roguelike · Pixel Graphics · Action

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

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

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

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Roguelite

Brotato
Shared: Action Roguelike · Bullet Hell · Singleplayer

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Pixel Graphics · Roguelike

Hades
Shared: Action Roguelike · Roguelite · Action

Dungreed
Shared: Action Roguelike · Roguelite · Action

Dead Cells
Shared: Action Roguelike · Pixel Graphics · Roguelite

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

Asgard's Fall — Viking Survivors
Shared: Action Roguelike · Casual · Roguelite

Star of Providence
Shared: Action Roguelike · Roguelite · Bullet Hell

Seraph's Last Stand
Shared: Action Roguelike · Casual · Bullet Hell

Nova Drift
Shared: Roguelite · Action Roguelike · Bullet Hell

Apocalypse Party
Shared: Casual · Action Roguelike · Singleplayer

Blazing Beaks
Shared: Action Roguelike · Roguelite · Action

Rogue Legacy
Shared: Action Roguelike · Action · Roguelike