Games like Vault Apocalypse
Games like Vault Apocalypse include Vampire Survivors, Nuclear Throne, BALL x PIT, Deep Rock Galactic: Survivor, and Halls of Torment. We matched them by the tags players give Vault Apocalypse on Steam (Action Roguelike, Bullet Hell, Top-Down Shooter, Roguelite, and Shooter): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Roguelite

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

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

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

Brotato
Shared: Bullet Hell · Action Roguelike · Roguelite

Enter the Gungeon
Shared: Action Roguelike · Bullet Hell · 2D

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

Megabonk
Shared: Action Roguelike · Roguelite · Bullet Hell

SYNTHETIK: Legion Rising
Shared: Top-Down Shooter · Roguelite · Action Roguelike

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

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

Roboquest
Shared: Action Roguelike · Roguelite · Shooter

暖雪 Warm Snow
Shared: Action Roguelike · Roguelite · 2D

Rocket Rats
Shared: Action Roguelike · Bullet Hell · Roguelite

Nova Drift
Shared: Bullet Hell · Action Roguelike · Roguelite

SYNTHETIK 2
Shared: Action Roguelike · Top-Down Shooter · Roguelite

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

Army of Ruin
Shared: Action Roguelike · Bullet Hell · Top-Down Shooter

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

The Last Stand: Aftermath
Shared: Top-Down Shooter · Action Roguelike · Roguelite

FatalZone
Shared: Action Roguelike · Bullet Hell · Roguelite

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

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