Games like Defend the Fort
Games like Defend the Fort include Hotline Miami, Hotline Miami 2: Wrong Number, Nuclear Throne, BALL x PIT, and Angel at Dusk. We matched them by the tags players give Defend the Fort on Steam (Action, Shooter, Tower Defense, Top-Down Shooter, and Bullet Hell): closest matches first, and among equally close ones the better-known games.

Hotline Miami
Shared: Action · Top-Down · Pixel Graphics

Hotline Miami 2: Wrong Number
Shared: Action · Pixel Graphics · Top-Down

Nuclear Throne
Shared: Action · Bullet Hell · Pixel Graphics

BALL x PIT
Shared: Action · Bullet Hell · Top-Down Shooter

Angel at Dusk
Shared: Action · Shooter · Bullet Hell

The Last Stand: Aftermath
Shared: Top-Down Shooter · Shooter · Zombies

Broforce
Shared: Action · Pixel Graphics · 2D

Escape From Duckov
Shared: Action · Shooter · Top-Down Shooter

The Final Station
Shared: Action · Pixel Graphics · 2D

Left 4 Dead 2
Shared: Shooter · Action · Zombies

Vampire Survivors
Shared: Bullet Hell · Pixel Graphics · 2D

Enter the Gungeon
Shared: Bullet Hell · Pixel Graphics · Action

Bit Blaster XL
Shared: Shooter · Bullet Hell · Action

Let Them Come
Shared: Action · Tower Defense · Shooter

ZERO Sievert
Shared: Shooter · Top-Down · Action

Cluckmech Oasis
Shared: Tower Defense · Top-Down Shooter · Action

Planes, Bullets and Vodka
Shared: Action · Shooter · Bullet Hell

12 is Better Than 6
Shared: Action · Shooter · Top-Down Shooter

LUFTRAUSERS
Shared: Action · Bullet Hell · 2D

Necrosmith
Shared: Tower Defense · Bullet Hell · Zombies

PUBG: BATTLEGROUNDS
Shared: Shooter · Action · Survival

DayZ
Shared: Shooter · Survival · Zombies

Splatter - Zombiecalypse Now
Shared: Action · Top-Down Shooter · Top-Down

Door Kickers: Action Squad
Shared: Action · Shooter · Pixel Graphics