Games like Skull Survivor
Games like Skull Survivor include Vampire Survivors, Megabonk, Brotato, Halls of Torment, and Enter the Gungeon. We matched them by the tags players give Skull Survivor on Steam (Action Roguelike, Action, Bullet Hell, Survival, and Roguelike): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Vampires

Megabonk
Shared: Action Roguelike · Roguelike · Bullet Hell

Brotato
Shared: Action Roguelike · Bullet Hell · Roguelike

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

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

Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · Roguelike

Yet Another Zombie Survivors
Shared: Action Roguelike · Zombies · Roguelike

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

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

Hades
Shared: Action Roguelike · Action · Roguelike

Scarlet Tower
Shared: Action Roguelike · Vampires · Bullet Hell

FatalZone
Shared: Action Roguelike · Bullet Hell · Survival

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

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

Magicraft
Shared: Action Roguelike · Bullet Hell · Roguelike

Death Road to Canada
Shared: Action Roguelike · Zombies · Survival

Nuclear Throne
Shared: Action Roguelike · Roguelike · Bullet Hell

Hades II
Shared: Action · Roguelike · Action Roguelike

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

Atomicrops
Shared: Action · Bullet Hell · Roguelike

Risk of Rain 2
Shared: Action Roguelike · Action · Roguelike

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

Arms of God
Shared: Action Roguelike · Bullet Hell · Action

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