Games like Frontline Frenzy
Games like Frontline Frenzy include Vampire Survivors, Brotato, Deep Rock Galactic: Survivor, Death Must Die, and Halls of Torment. We matched them by the tags players give Frontline Frenzy on Steam (Action Roguelike, Arena Shooter, RPG, Top-Down Shooter, and Bullet Hell): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

Brotato
Shared: Action Roguelike · Bullet Hell · Arena Shooter

Deep Rock Galactic: Survivor
Shared: Action Roguelike · Bullet Hell · Top-Down Shooter

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

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

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

FatalZone
Shared: Action Roguelike · Bullet Hell · Arena Shooter

Megabonk
Shared: Action Roguelike · Bullet Hell · Roguelite

Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Action

20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Top-Down Shooter

Arms of God
Shared: Action Roguelike · Top-Down Shooter · Arena Shooter

Hades
Shared: Action Roguelike · Roguelite · Action

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

God Of Weapons
Shared: Action Roguelike · RPG · Arena Shooter

SNKRX
Shared: Action Roguelike · Arena Shooter · Top-Down Shooter

Nova Drift
Shared: Action Roguelike · Bullet Hell · Arena Shooter

Vital Shell
Shared: Action Roguelike · Arena Shooter · Bullet Hell

Glyphica: Typing Survival
Shared: Action Roguelike · Arena Shooter · Top-Down Shooter

Magicraft
Shared: Action Roguelike · Bullet Hell · RPG

Noobs Are Coming
Shared: Action Roguelike · Arena Shooter · Bullet Hell

Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · RPG

Hades II
Shared: Action Roguelike · Action · RPG

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

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