Top similar games like Galactic Frontiers - Defense Protocol:

Element is a realtime strategy space game for people who don't have time to play realtime strategy space games. Generate energy, mine element, build attack and defence units, and destroy the enemy while maintaining a balance between earth, air and water.

This is a prologue for the main game Grimstar - a single-player real-time strategy game with a story-driven campaign. The sudden death of your brother has hit you hard. However, the corporation for which he has sacrificed his life requires you to take his place until his contract is fulfilled...

Join our machine legion to conquer the world.

Step into the arena with IDUN: Prologue, a thrilling slice of our full-length defense RTS where real-time strategy meets rogue-lite chaos. Fight your way through unique mission objectives with overwhelming swarms of enemies.

Taur is an action-strategy sci-fi game. Control the Prime Cannon and unlock all of its powerful weapons and abilities. Build turrets, droids, aircraft and more as you fight to protect the homeworld of the Tauron droids against a relentless invasion. Will your Taur stand against the Imperion warmachine?

A grand and intense tower defense science fiction game, where you only need to purchase once to enjoy all the content of the game.

2089 - Space Divided is a classic science fiction real-time strategy game in which you collect resources, build up your base, train troops and destroy your opponents with tactical skill.

After the destruction of the EARTH in 2150, the leaders of the Eurasian Dynasty escaped on board an evacuation fleet. Now they are fighting for the survival of the human species. Their base is one large building comprising of smaller variable parts.

On the cosmic frontier, humanity has fought alien species for a century. As traditional defenses fall to new-gen alien mechs, tech giant ShellMobile—human-centered at its core—kindles new hope via breakthroughs in extraterrestrial titanium ore research.

Command distinct factions in a desperate struggle for power and resources in Tempest Rising - a classic RTS set on Earth after a nuclear war.

Step into the world of galactic combat in "WarOS", a Chinese sci-fi game! It creates its own structure, integrating the core gameplay of RTS with the details, plot and growth system of RPG, simplifying complex micro-manipulation, and making the game experience both fun and exhilarating.

The creeper is flowing through canyons to your base while you rush to build a space station in 3D by sending packets to your building foundations and pushing the fluid back with your weapons, eventually capturing the sources of the enemy or being drowned by it.

ASSEMBLE AND COMMAND YOUR SPACE FLEET TO VICTORY

A tower defense strategy science fiction game, in the future era, when aliens invade the solar system, players need to build various turrets to resist alien attacks and guard the Milky Way and solar system.

A Byte War is a real time strategy game where you lead a race of block-based machines against a machine threat from another dimension. Construct buildings from blocks arranged in various patterns and leverage your machines to convert the world around you.

A defense RTS where you can move turrets at will. Extract resources, upgrade technology, and defend against enemy swarms in a gripping space campaign. Hold the line, set up your turrets, and brace for screen-filling hordes!

Toy Empires is a unique fast-paced, micro-management-free real-time strategy game. All you have to do is make the purest decisions and games!

Do you like Tower Defense games with Strategy elements? Well, look no further! We've got exactly what you're looking for! Get ready to defend your settlement from enemies using a huge arsenal of towers!

A self-built level tower defense game where you compete with friends and online players to see whose creativity is more popular. You control the game content, design the difficulty level, come create your own tower defense game!

World order is revolutionary sci-fi real-time strategy, the main feature of which are modular units

Includes 47 Steam achievements, leaderboards, and stats!

A classic tower defense game with ordinary graphics didn't fascinate you? Well, let's give a try and see how long you can defend! Show your commanding skills and prove no enemy can break your defense! Be a hero and save humanity with the LAST DEFENSE!

Star Trek: Prelude is a space-based game that builds defense towers on earth to defend against alien invaders called Black Ember.

This is a sci-fi strategy game featuring a Defense Mode focused on tower defense and an Attack Mode focused on combat. The game includes over 30 different buildings and units, all of which can be upgraded through entry editing to enhance their performance and firepower.

Frontier Control: Invasion is a Real-Time Strategy defense game in which you play the commander of a human space colony under the attack of outer space robots. Build your base, train your colony, and fight herds of enemies and bosses.

Strategy, timing and fortune: Novel and immersive tower defense game experience!

Stellar Reach is a 4X sci-fi strategy game where you control a faction vying for dominance across a hostile galactic frontier. Guide your empire through conquest, prosperity, or industrial power as you advance through six distinct tech trees and forge your path to victory.

A casual and relaxed strategy game that is easy to play, yet difficult to master. Counter enemy waves by building and upgrading the right units. You make the decisions, the rest happens automatically. Set in a sci-fi theme with more than 30 unique units and 70 unique upgrades to choose from!

Creeper World 3 is what happens when cellular automata takes over a strategy simulation. Instead of discrete units that attack your base, a fluid-like substance spreads over the terraformable terrain. Your base, your weapons, your strategy... you must adapt them all.

A sci-fi real-time strategy game. An existential war among asteroids in classic RTS style. Build and defend, produce and upgrade, attack and annihilate!

A steampunk RTS set in a world ruled by AI. Create autonomous steam-powered machines, manage resources, and rebuild civilization. Explore the ruined surface and reclaim territories abandoned by decaying artificial intelligence systems.

Tau Cubis is a mazing tower defense game set in colorful sci-fi landscapes. Use your strategic skills to overcome numerous challenges and advance through the leaderboards.

Be the ultimate CEO and military strategist in this genre fusion of strategy and business management. Create your own company, hire employees, research weapon technology, and take control of units on the battlefield to defend the moon against an alien invasion. Aliens down, profits up!