Top similar games like Planetary Defense Force:
Planetary Defense Force $5.99
Jump into the shoes of an interplanetary defender! Grab weapons, build towers, expand ground economics and protect planets from space invasions in this unique mix of twin-stick shooter, tower defense and city builder game.
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Small People Defense$4.99
Use projectile-based towers, unique tower interactions, and overpowered weapons to strategically conquer the endless waves in this 3rd-person tower defense game!

Final Fort$3.99
FinalFort is a survival game with defense as the core gameplay, and when the end comes, you use the last human shelter to constantly dig minerals, build walls and various turrets to defend against the endless zombie army.

RoboHuntersFREE
Top-down 3D action shooter. Fight against swarms of rogue AI machines and survive as long as you can!

Kona & SnowrabbitFREE
Kona, an ice artist with a reputation for mischief, and Snowrabbit, a white-furred snow rabbit full of desire. After hearing the story of Aquus, the mermaid goddess, the two down-on-their-luck artists break into the monastery of Aquus, nicknamed "the sea on land," to make a statue of a goddess.

Sea of Change$3.99
Sea of Change is a game that blends exploration with strategic base defense. Build, defend, and expand your base against waves of enemies, all while uncovering the mysteries of a dynamic world that shifts with every playthrough. Set sail to find islands and collect resources. How long can you last?

Escape And Build$6.99
Escape from the enemies and build a fortress to face them, you can play alone or in online games of up to 4 players.

Slime Rush : Leshy and the Magic Book$3.99
Slime Rush! Jump into a thrilling hack-and-slash adventure with Leshy and the Magic Book! Wreck relentless slimes, unleash crazy magic combos, power up with runes, and reclaim the Red Panda Temple! Get ready to bash, blast, and dominate!

Space Break$1.99
Build ships from elements and go to fight. The player can control several different spaceships at the same time (fleet battles). During the battle you can switch ships and different ships can attack different opponents. Choose your ships and tactics for each battle.

Automatrons - Tower Defense$3.99
Join our machine legion to conquer the world.

Replicators Defence$0.99
Small game in Tower Defence genre with elements of shooter. Kill Replicators all by yourself or make perfect defence with different turrets.

Citadelic$9.99
Citadelic is a base building and defending strategy game with roguelite elements. Survive against waves of constantly evolving enemies while expanding your base and managing resources.

My Last Stand: Survivors$3.99
Zombies are approaching fast. You have nothing to trust but the weapon in your hand. Eliminate zombies as quickly as possible. Survive. Gain upgrade points to unlock different abilities. And become stronger. Hold your position until the end of time. Then you can escape from this bloody hell.