Games like Frontline Survivors
Games like Frontline Survivors include Vampire Survivors, Rogue: Genesia, Halls of Torment, Death Must Die, and Enter the Gungeon. We matched them by the tags players give Frontline Survivors on Steam (Bullet Hell, Twin Stick Shooter, Roguelite, PvE, and Shooter): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Roguelite · 2D

Rogue: Genesia
Shared: Bullet Hell · Roguelite · Twin Stick Shooter

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

Death Must Die
Shared: Bullet Hell · Roguelite · 2D

Enter the Gungeon
Shared: Bullet Hell · Twin Stick Shooter · Pixel Graphics

Deep Rock Galactic: Survivor
Shared: Bullet Hell · Roguelite · PvE

Nova Drift
Shared: Bullet Hell · Roguelite · Action RPG

BALL x PIT
Shared: Roguelite · Bullet Hell · Action

Soulstone Survivors
Shared: Bullet Hell · Roguelite · Action RPG

Star of Providence
Shared: Bullet Hell · Roguelite · 2D

Megabonk
Shared: Roguelite · Bullet Hell · Indie

Time Wasters
Shared: Bullet Hell · Twin Stick Shooter · Roguelite

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

Nuclear Throne
Shared: Bullet Hell · Roguelite · Pixel Graphics

Boneraiser Minions
Shared: Bullet Hell · Roguelite · 2D

Funguys Swarm
Shared: Bullet Hell · Roguelite · Action RPG

Atomicrops
Shared: Bullet Hell · Roguelite · Twin Stick Shooter

Swarm Grinder
Shared: Roguelite · Bullet Hell · 2D

Nomad Survival
Shared: Bullet Hell · Roguelite · PvE

Hero Siege
Shared: Action RPG · Pixel Graphics · Top-Down

Noobs Want to Live
Shared: Bullet Hell · Roguelite · Action RPG

Bloody Hell
Shared: Bullet Hell · Twin Stick Shooter · Pixel Graphics

20 Minutes Till Dawn
Shared: Bullet Hell · Roguelite · Pixel Graphics

Slime 3K: Rise Against Despot
Shared: Bullet Hell · Roguelite · 2D