Games like Frontier Survivors
Games like Frontier Survivors include Megabonk, Vampire Survivors, Brotato, BALL x PIT, and 20 Minutes Till Dawn. We matched them by the tags players give Frontier Survivors on Steam (Action, Action Roguelike, Roguelike, Bullet Hell, and Shoot 'Em Up): closest matches first, and among equally close ones the better-known games.

Megabonk
Shared: Action Roguelike · Roguelike · Bullet Hell

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Pixel Graphics

Brotato
Shared: Roguelike · Action Roguelike · Bullet Hell

BALL x PIT
Shared: Action · Bullet Hell · Roguelike

20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Shoot 'Em Up

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

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

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

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

Hades
Shared: Action Roguelike · Action · Roguelike

Dead Cells
Shared: Roguelike · Action Roguelike · Pixel Graphics

Nuclear Throne
Shared: Action Roguelike · Roguelike · Action

Atomicrops
Shared: Action · Roguelike · Bullet Hell

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

Hades II
Shared: Action · Roguelike · Action Roguelike

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Roguelike · Pixel Graphics

Hero Siege
Shared: Action Roguelike · Pixel Graphics · Roguelike

Dome Keeper
Shared: Action · Roguelike · Sci-fi

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

Returnal™
Shared: Action · Bullet Hell · Roguelike

Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · Roguelike

Sephiria
Shared: Action Roguelike · Roguelike · Action

Wizard of Legend
Shared: Action Roguelike · Roguelike · Pixel Graphics

Dungreed
Shared: Action Roguelike · Roguelike · Action