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.

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.

Join our machine legion to conquer the world.

Grimstar is a real-time strategy game with a story-based single-player campaign. Your brother's sudden death has hit you hard, but the laws of the corporation for which he laid down his life dictate that you must take his place until his contract is fulfilled...

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 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!

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...

Lead the operations of an artificial intelligence program with only one aim – to clear the Earth from the remains of humanity. Conquer the world campaigning on a single-player dynamic battleground or play with your friends during a real time strategic gameplay.

A sci-fi roomscale VR Tower Defense game. Strategize to destroy waves of rogue robots and assist the powerful turrets with a handheld drone. Build and collect resources and help evacuate your crew from the alien planet.

Molten Armor is an action tower defense game with a non-linear story in sci-fi setting! Command defenses and stop hordes of enemies! Fight on land, sea and in the skies!Decisions taken in the heat of battle will change the course of the war.

Classic RTS gameplay fused with a modern roguelike. Shape your build each run by assembling an evolving arsenal of powerful units and facilities. Harvest resources, build out your base. Raise your army and call down powerful strikes to overcome the forces threatening your survival.

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 classic single-player RTS set in a Solar System ruled by megacorporations. Journey from Mars all the way to Planet 9 and uncover the secrets of the BlackChain.

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.

After a series of apocalyptic climate events, Earth is now under attack by a legion of penis shaped aliens who seek to wipeout what remains of the human race. Defend what is left of mankind's most iconic landmarks in this fast-paced crazy Tower Defense game.

Electromaze Defense is a classic tower defense game where you create your own maze. With a wide variety of maps, towers and upgrades, Electromaze Defense will keep you hooked for hours on end! Can you build the perfect maze?

Wonder Defense: Chapter Earth is a strategy game based on Earth and Aliens in which you act as a General to accomplish survive and move to Mars.

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

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.

The unstoppable fluid enemy has returned and destroyed every world in its path! Defend against Creeper as it floods across the 3D terrain in this real time strategy game where the enemy is a fluid.

ASSEMBLE AND COMMAND YOUR SPACE FLEET TO VICTORY

Build your towers, plan your efforts, watch out for changing paths and strike back against the alien invaders in this challenging tower defense game!

Take control of a fleet commander returned from exile, rise through the ranks of the United Space Federation forces and join an epic war across the stars.

Cyber Tower is a tower defense game emphasizing grid movement and path construction. As a military commander, customize your defense with various towers and strategic paths. Stop waves of virus-infected autonomous vehicles from invading your city!

Byte Lynx is a fast-paced RTS with no units. Build defenses, dismantle your enemy, and steal their buildings in this deeply tactical building combat-based strategy game. Expand your arsenal across a series of diverse levels!

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

Gewevo : Interstallar is a space strategy game derived from the tabletop RPG universe Gewevo. It offers an approach a little closer to a wargame with regard to the empire management aspect. Made with passion by a one-man team;)

A classic RTS in VR with simulated physics. Move your units by throwing, stack units to increase their power. Gather resources, build a base and an army, expand across the map and defeat your enemies.

Free layout 3D tower defense war game. There are tanks and Titans on land, battleships and swarms in the sky, and missiles in space. In the face of the enemy, your weapons are not only machine guns, cannons, rockets, but also lasers, cruise missiles and interceptor satellites.

Millennium Conflict: a real-time strategy game set in space where you must act fast to stop attackers from conquering your universe. With 40 levels, weapon upgrades, and new generals to recruit, it's up to you as the only surviving male to lead your troops to victory.

An exciting sci-fi real-time strategy game. You are the leader of a band of elite Marines on a rescue mission; it is your job to secure the outpost and rescue lost miners. Aliens are running amok; it won't be easy...

Take command of the world's military elite and liberate planetary resources. Fabricate bases, train soldiers, build a mechanized army and rid the planet of powerful enemy combatants and mysterious alien threats.

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!

A harsh sand planet has become the stage for a brutal war between three Great Clans. For the power over rare minerals each wants to prove their superiority. In the heat of dynamic battles with the enemy's troops, be prepared to face and attack giant Sand Snakes.