Games like Frontier Fire
Games like Frontier Fire include Skul: The Hero Slayer, Anomaly Agent, Risk of Rain 2, Rogue Legacy, and Hades. We matched them by the tags players give Frontier Fire on Steam (Action, 2D Fighter, Roguelike, Shooter, and Action Roguelike): closest matches first, and among equally close ones the better-known games.

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

Anomaly Agent
Shared: Action Roguelike · 2D Fighter · Side Scroller

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

Rogue Legacy
Shared: Roguelike · Action · Action Roguelike

Hades
Shared: Action Roguelike · Action · Roguelike

Megabonk
Shared: Roguelike · Action Roguelike · Action

Hades II
Shared: Action · Roguelike · Action Roguelike

Crab Champions
Shared: Action Roguelike · Roguelike · Shooter

BALL x PIT
Shared: Action · Roguelike · Action Roguelike

Stick It to the Stickman
Shared: Action · Roguelike · 2D Fighter

Soda Crisis
Shared: Action · Side Scroller · Shooter

Nova Drift
Shared: Shoot 'Em Up · Action Roguelike · Shooter

Nuclear Throne
Shared: Roguelike · Action Roguelike · Action

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

Gunfire Reborn
Shared: Roguelike · Action · Action Roguelike

BPM: BULLETS PER MINUTE
Shared: Action · Roguelike · Shooter

Spiritfall
Shared: 2D Fighter · Action Roguelike · Roguelike

Enter the Gungeon
Shared: Roguelike · Action Roguelike · Action

Risk of Rain (2013)
Shared: Roguelike · Action · Action Roguelike

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

Brawlhalla
Shared: 2D Fighter · 2D Platformer · Action

Dungreed
Shared: Roguelike · Action · Action Roguelike

Dead Estate
Shared: Roguelike · Action Roguelike · Action

BioShock Infinite
Shared: Action · Shooter · Fantasy