Games like Supercat Survivors
Games like Supercat Survivors include Megabonk, Brotato, 20 Minutes Till Dawn, Vampire Survivors, and Tower of Babel: Survivors of Chaos. We matched them by the tags players give Supercat Survivors on Steam (Action Roguelike, Action, Bullet Hell, Bullet Heaven, and Deckbuilding): closest matches first, and among equally close ones the better-known games.

Megabonk
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Brotato
Shared: Action Roguelike · Bullet Hell · Roguelike

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

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelike

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

Soulstone Survivors
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

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

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

Yet Another Zombie Survivors
Shared: Action Roguelike · Bullet Heaven · Singleplayer

Nordic Ashes: Survivors of Ragnarok
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

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

Hades
Shared: Action Roguelike · Action · Roguelike

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

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

Atomicrops
Shared: Action · Bullet Hell · Action Roguelike

Magicraft
Shared: Action Roguelike · Bullet Hell · Roguelike

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

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

Hand of Fate
Shared: Action Roguelike · Deckbuilding · Roguelike

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

Nuclear Throne
Shared: Action Roguelike · Roguelike · Bullet Hell

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

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

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