Games like Firebase Defence
Games like Firebase Defence include Hotline Miami, Hotline Miami 2: Wrong Number, Infested Planet, People Playground, and Warhammer 40,000: Dawn of War III. We matched them by the tags players give Firebase Defence on Steam (Action, Strategy, Indie, Gore, and Violent): closest matches first, and among equally close ones the better-known games.

Hotline Miami
Shared: Action · Indie · Violent

Hotline Miami 2: Wrong Number
Shared: Gore · Action · Violent

Infested Planet
Shared: Strategy · Action · Indie

People Playground
Shared: Gore · Violent · 2D

Warhammer 40,000: Dawn of War III
Shared: Strategy · Action · RTS

Party Hard
Shared: Strategy · Indie · Action

GemCraft - Chasing Shadows
Shared: Strategy · Indie · Action

Taur
Shared: Strategy · Action · Tower Defense

Door Kickers
Shared: Strategy · Action · Indie

My Friend Pedro
Shared: Action · Indie · Gore

Mindustry
Shared: Strategy · Tower Defense · Base Building

Creeper World 3: Arc Eternal
Shared: Strategy · Indie · Tower Defense

Kingdom Rush - Tower Defense
Shared: Strategy · Tower Defense · Action

Ape Out
Shared: Indie · Gore · Action

Company of Heroes
Shared: Strategy · Action · RTS

Warhammer 40,000: Dawn of War - Anniversary Edition (Classic)
Shared: Strategy · Base Building · RTS

CARRION
Shared: Gore · Action · Indie

Aliens: Dark Descent
Shared: Strategy · Action · RTS

Shadow Tactics: Blades of the Shogun
Shared: Strategy · Indie · Action

DOOM Eternal
Shared: Action · Gore · Violent

They Are Billions
Shared: Strategy · Base Building · Tower Defense

Blasphemous
Shared: Gore · Indie · Violent

Plants vs. Zombies GOTY Edition
Shared: Strategy · Tower Defense · Singleplayer

Door Kickers 2: Task Force North
Shared: Action · Strategy · Top-Down