Games like THE LAST DEFENSE!
Games like THE LAST DEFENSE! include Bloons TD 6, XCOM 2, Plants vs. Zombies GOTY Edition, Starship Troopers: Terran Command, and Creeper World 4. We matched them by the tags players give THE LAST DEFENSE! on Steam (Strategy, Tower Defense, Wargame, 2D, and 3D): closest matches first, and among equally close ones the better-known games.

Bloons TD 6
Shared: Strategy · Tower Defense · 3D

XCOM 2
Shared: Strategy · Sci-fi · Tactical

Plants vs. Zombies GOTY Edition
Shared: Tower Defense · Strategy · 2D

Starship Troopers: Terran Command
Shared: Strategy · Military · Wargame

Creeper World 4
Shared: Tower Defense · Wargame · Strategy

Minimalist Tower Defense
Shared: Strategy · Tower Defense · 2D

Foxhole
Shared: Wargame · Military · Strategy

Kingdom Rush - Tower Defense
Shared: Strategy · Tower Defense · 2D

Broken Arrow
Shared: Strategy · Wargame · 3D

Super Sanctum TD
Shared: Strategy · Tower Defense · Isometric

Kingdom Rush Origins - Tower Defense
Shared: Strategy · Tower Defense · 2D

Outpost: Infinity Siege
Shared: Tower Defense · 3D · Strategy

Creeper World 3: Arc Eternal
Shared: Strategy · Tower Defense · Sci-fi

Warhammer 40,000: Battlesector
Shared: Strategy · 3D · Isometric

Infested Planet
Shared: Strategy · Tower Defense · Top-Down

GemCraft - Chasing Shadows
Shared: Strategy · Tower Defense · Top-Down

Wargame: Red Dragon
Shared: Strategy · Wargame · Military

Kingdom Rush Frontiers - Tower Defense
Shared: Strategy · Tower Defense · 2D

Tempest Rising
Shared: Strategy · Isometric · 3D

ROMANCE OF THE THREE KINGDOMS XIV
Shared: Wargame · Military · Strategy

Commandos: Origins
Shared: Strategy · Wargame · 3D

Rogue Tower
Shared: Strategy · Tower Defense · 3D

Sir, We Have an Orc Problem
Shared: Tower Defense · Strategy · Military

Thronefall
Shared: Strategy · Tower Defense · 3D