Top similar games like Crystal Nexus: Alien Siege:

Galactic Garrison is a sci-fi, turn-based tower defense game where you defend your base from relentless alien waves on Mars. Deploy soldiers, build barricades, and upgrade defenses to withstand attacks. Earn powerful reward cards to gain strategic advantages and outmaneuver your enemies.

"SYNCHRONIZERS: Undead Marines" blends high-quality Three-Lane Tower Defense with Reverse Tower Defense gameplay. Command dynamic units in a thrilling narrative reminiscent of a StarCraft and Plants Vs. Zombies fusion! Your choices will forge the path to victory—or defeat.

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 orbital strikes to overcome the forces threatening your survival.

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.

Join our machine legion to conquer the world.

Sphere Invasion is Sci-Fi Tower Defence. Build your own road and defend it with 7 unique towers.

AT THE LIMITS OF EARTH, AT THE EXTREMITY OF HEAVEN. A REAL-TIME STRATEGY NIGHTMARE.

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.

Mini Continental Saga is a biotope strategy history card game letting you freely stir small worlds! Human, elf, slime? Or lead your fishman to create your favorite fictional world! One play takes 5 to 30 minutes. Weave a tale that you've seen somewhere before, but doesn't exist anywhere else!!!!

You wake up in a gloomy room where you are imprisoned. Only by mastering an enigmatic Tower Defense - Roguelike - Deckbuilder can you uncover the secrets lurking in the shadows of this facility.

SENTRY is an action-defense first person shooter where you defend your spaceship against invading aliens. Plot an escape route through hostile space and battle the enemy across your vessel with the support of traps, turrets and environmental destruction.

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.

Employ lethal turrets, traps, and gadgets to defend against an onslaught of evolving creeps! Step into a twisted, hyper 3D, mind bending realm. Upgrade and adapt your defenses. Become a master maze crafter. Collect bizarre artifacts. Rush creeps for lucrative rewards, and succumb to greed!

Strategic roguelike tower defense game where you fortify your defense line by stacking cards in deckforts, play various cards on enemies and deployable grids, and receive general contributions to your defense from altar structures.

Play cards in real-time in this action-packed deckbuilding horde survival roguelike. Forge a deck, lead your squad, and defend the harvester in intense battles across enemy-infested planets. Unlock Ascension Levels to face rising challenges with incremental content and balance changes.

Defend entire planets against hostile invaders in this full 3D tower defense game. Manage resources and space while constructing weapons, defenses, and structures to withstand the destructive onslaught across multiple planets.

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!

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

The Creeper always returns... but this time, we have the advantage! Explore new worlds where the creeper, sand, and particles all merge in a pixel level simulation pushing the bounds of real time strategy into new territory.

Defend against thousands of enemies in this explosive tower defense game. Deploy upgradable towers and unleash powerful orbital abilities as you try to protect Earth's first colony world from destruction.

Have you ever been in a robbery and didn't have weapons to defend yourself and your house? Well now you can, with hold your houses you have a variety of weapons to use to help you defend yourself, your house and take on those unwanted robbers.

Do not be modest! Think fast, do event faster for essential dominance on Square Wars

EARTHLESS is a sci-fi, roguelike deckbuilder where humankind has been thrust into the cosmic wind on a fleet of starships captained by you. To find a new home, you must draw your own path through the stars and play the hand you’re dealt. You are our hope in the darkness.

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.

You believed tower defense is only about building towers? That's not quite right – because AIRA VR is not like other tower defense games in virtual reality. Once the battle starts you find yourself in the midst of the fight!

Reign supreme in a world of walls and spells. Discover powerful strategies and outsmart your rivals with cunning tactics to rise through the ranks and become the one true Wallstar!

There’s more than one proper way to use a piano! Discover it in Ridiculous Catapult Simulator, a wacky deck-building experience. Launch insanely dull daily-life ammo to create insanely smart combos and bombard silly enemies coming to lick your castle to death. Careful, it’s addictive!

In Space Empires: Starfury you are on a wild intergalactic ride through the Space Empires universe. You are an undercover agent for the TCN (Terran Confederation Navy) trying to determine the cause of a recent escalation of pirate attacks in the Neutral territories.

Take command of the mech and become the ultimate strategist. Construct impregnable defense facilities, handpick potent skills, lead your troops, and defy relentless enemy assaults. Will you emerge victorious in this thrilling battle for supremacy?

MILLIONS OF ALIENS WILL DIE!Radiant Defense is a tower defense game set in a vibrant universe invaded by countless alien hordes.Build your space fortress any way you wish, set up wide variety of weapons and traps and let the invasions begin!

Volition's classic is back. Descent: FreeSpace is the quintessential old school space shooter. With a deep story, great graphics and engaging battles against fighters to capital ships it keeps you moving. Breakout that flight stick and enroll with the Grand Terran Alliance today.

Elementia is a strategy-focused rogue-lite tower defense game set in a fantastic universe. In a world where warring nations have suddenly formed an alliance against a common enemy, you will defend your nation and develop strategies for victory. Defeat your enemies and become a hero!

Join in on the next gold rush and become a prospector in space. In this unique tower defense you can set up and reposition towers for maximum efficiency and adapt to the environment.

Zero-Point is a 3D space roguelike featuring tactical ship-to-ship combat, crew command and an immersive view of your ship's interior. As Captain of a Star Federation cruiser, lead your crew and ship to victory over the rebellious Galactic Liberation Front!