Games like Boothill Survivors
Games like Boothill Survivors include Megabonk, The Binding of Isaac: Rebirth, Vampire Survivors, Death Must Die, and Hades. We matched them by the tags players give Boothill Survivors on Steam (Action Roguelike, Bullet Heaven, Roguelite, PvE, and Perma Death): closest matches first, and among equally close ones the better-known games.

Megabonk
Shared: Action Roguelike · Bullet Heaven · Roguelite

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

Vampire Survivors
Shared: Action Roguelike · Roguelite · 2D

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

Hades
Shared: Action Roguelike · Roguelite · Roguelike

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

Noita
Shared: Roguelike · Difficult · Action Roguelike

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

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

Soulstone Survivors
Shared: Action Roguelike · Bullet Heaven · Roguelite

Halls of Torment
Shared: Action Roguelike · Roguelite · Roguelike

Risk of Rain (2013)
Shared: Action Roguelike · Roguelike · Difficult

Dead Cells
Shared: Action Roguelike · Roguelike · Roguelite

Vagante
Shared: Action Roguelike · Roguelite · Difficult

Dungreed
Shared: Action Roguelike · Roguelite · Roguelike

Pathogenic
Shared: Bullet Heaven · Action Roguelike · Roguelike

Nuclear Throne
Shared: Action Roguelike · Roguelike · Difficult

暖雪 Warm Snow
Shared: Action Roguelike · Roguelite · Roguelike

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

Brotato
Shared: Action Roguelike · Bullet Heaven · Roguelike

Caveblazers
Shared: Action Roguelike · Roguelite · Roguelike

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

Enter the Gungeon
Shared: Action Roguelike · Roguelike · Difficult

Streets of Rogue
Shared: Action Roguelike · Roguelite · Roguelike