Games like Polygon Panic
Games like Polygon Panic include Vampire Survivors, BALL x PIT, Megabonk, Enter the Gungeon, and Crab Champions. We matched them by the tags players give Polygon Panic on Steam (Action, Casual, Arcade, Roguelike, and Shooter): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Casual

BALL x PIT
Shared: Action · Arcade · Roguelike

Megabonk
Shared: Roguelike · Action Roguelike · Action

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

Crab Champions
Shared: Action Roguelike · Roguelike · Arcade

Halls of Torment
Shared: Action Roguelike · Action · Roguelike

Nuclear Throne
Shared: Roguelike · Action Roguelike · Action

Brotato
Shared: Roguelike · Action Roguelike · Bullet Hell

Planes, Bullets and Vodka
Shared: Action · Casual · Arcade

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

Rocket Rats
Shared: Casual · Action Roguelike · Action

Nova Drift
Shared: Arcade · Bullet Hell · Action Roguelike

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

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

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Casual

Astro Prospector
Shared: Casual · Roguelike · Action Roguelike

Rogue Legacy
Shared: Roguelike · Action · Action Roguelike

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

Rogue: Genesia
Shared: Arcade · Action Roguelike · Bullet Hell

Hades
Shared: Action · Action Roguelike · Roguelike

Bit Blaster XL
Shared: Arcade · Bullet Hell · Shooter

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

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

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