Top similar games like Alive as a Service:

Valdis est un hybride dynamique tower defense et third-person shooter en univers sci-fi. Défendez le noyau énergétique d’une station spatiale contre des vagues de zombies, combinez tourelles et éléments, déclenchez des réactions dévastatrices et survivez avec votre fusil à pompe !

They buried the truth. The invasion did not end. Now it is coming home. Grave Orbit is a dark sci-fi survival campaign of relentless escalation, impossible odds, and a war that grows far beyond anything humanity was prepared to face.

Spectral Realm is a top-down tower defense Rogue game, where players need to play the role of an astronaut who has just landed on a different planet to block a constant stream of attacking native creatures and continuously strengthen themselves with the gems contained within their bodies.

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

Gear up and get going! Defend your outposts from waves of alien enemies with your mech. Build and upgrade your base, protecting the extraction of the mysterious planetary system’s rich resources!

AsTroops is a roguelike card-based space combat game. Build your fleet, choose cards with machine gun, rocket, and electric weapons, and fight real-time battles to break the alien blockade.

Design and drop your droids to fight, build, and conquer. Mine resources and outlast the relentless swarm to claim the planet.

A tower-defense game with roguelite elements on fully explorable mini planets! Travel the galaxy of Vyrosa, land on planets, and defend your drilling equipment while mining fuel to continue your journey throughout the galaxy!

Defend the milk at all costs! Place towers, build your base, recruit minions, and battle endless swarms of enemies. Unlock new towers, characters and base upgrades, and upgrade them to create ridiculous builds. Every run is unique.

The ultimate space capital ship combat compendium is the evolution of hard core space combat sims. The only game of its kind currently in existence.

Outpost Ginga follows the events of a research and production space station that was attacked at the beginning of the Automaton War. While that station was captured by the abhorrent Automatons the control center managed to make an emergency FTL jump, becoming lost in the vastness of space. 

Defend Mars from humans

Survivor: Spark is the first episode of a series of anti alien invasion games. It's a classic transcendental third person shooting game!

Deep Sixed is a roguelike space sim that will force you to use strategy, ingenuity and duct tape to keep your ship (and your skull) in one piece as you risk exploring a mysterious nebula protected by dangerous alien creatures.

Fusion of Vampire Survivors Like and Tower Defense! Survive with Towers against waves of enemies. Build towers by day, survive endless enemy waves by night. Expand your territory, gain experience, and grow stronger with each battle. How long can you survive?

Dive into Astronaut Assault, a third-person Sci-Fi tower defense game, and battle against relentless enemy waves in diverse arena settings. Arm yourself with an array of turrets, traps, and gadgets to halt, hinder, and outmaneuver your foes.

A plague of monsters and zombies threatens the world, and only an elite squad can stop it! Fight in intense arena-style battles, eliminate enemies, use towers to your advantage, and evolve with exclusive upgrades. Each match is a new chance to save the world!

Become a Captain! Fly your ship and command your crew as you compete to become Champion in a winner-takes-all reality show. Build relationships and plot betrayals to avoid getting voted off the season and become the last captain standing. Optional VR support.

Sixty basic cores, hundreds of base station equipment, and thousands of chips, you can freely cooperate and shoot through the dual-angle joystick operation in a survival Roguelike game! Explore the sci-fi space and build your strongest battleship!

Dawnhelm Defense is a strategic tower defense game set in a medieval-fantasy world where players must defend the mighty fortress of Dawnhelm from relentless waves of enemy invaders. You will build and upgrade powerful towers and deploy magical abilities to stop hordes of enemies.

Start Fighter is an arcade game about the battle of spaceships. Explore the space station, shoot down enemy ships with heavy laser cannons, and control a maneuverable battle starship or a giant cruiser.

5Min Space Battle is a fast-paced third-person space shooter. Pilot different fighters through intense battles, eliminate enemy threats, and level up your fighter to boost its performance. Each fighter has unique combat capabilities, defining your playstyle in thrilling 5-minute skirmishes.

Drop Order is a dark sci-fi tactical tower defense where every turret placement shapes both your firepower and the enemy's route. Build synergistic defenses, create deadly mazes, and survive alien hordes with cards and hands-on drone combat.

Craft Your Ultimate Circular Fortress! Dive into SHOOPER NOVA, where you choose props and components to build a unique fortress. Unlock combos to shape your strategy and battle style. Become an unstoppable barrage machine and obliterate waves of enemies from all directions!

"VOIDCRISIS" is a four-player tower offense game on an undulating battlefield. Operate combat bio-machines called VA (Vital Armor) drawn with dynamic mechanical art shaders and work together to clear high-difficulty stages.

“The Clone Cycle” is a third-person sci-fi roguelite shooter. Awaken in a collapsed cloning facility, battle aberrant clone lifeforms, collect weapons, abilities and chip modules to break through blockades and reveal the cruel truth behind endless replication cycles.

A strategic and action-packed base survival game where you mine crystals, build units, and defend your base against waves of UFOs. Defeat enemies, gather resources, and unlock new planets to expand your defenses. Are you ready to conquer the galaxy?

Pilot Force Simulator throws you into the heart of a chaotic space battle. Dodge waves of bullets, feel the thrill of near-misses, and unleash powerful attacks in an intense, fast-paced fight through the stars!

Your battleship has been attacked by unknown forces. Take control of your spacecraft, shoot them down, and embark on a journey of vengeance!From the invaded battleship, through asteroid fields, and into enemy bases, you will face a series of battles on your journey for vengeance.

Our brave hero Abda lost his father. After his death, he remained the only one of his kind. Everyone he loved died. After the funeral, he inherited his father's old starship. After fixing the flying saucer he had inherited, Abda got ready to go. Thus began the story of Abda Redeemer.

A tactical defense game where you build the battlefield itself. Lure enemies through your maze using traps, towers, and godly powers.

Rise of Mutant Swarms is a strategy survival tower-defense game where you defend the base against waves of evolving mutant enemies. Place and upgrade turrets, adapt to enemy abilities, and make critical decisions as the pressure rises with every wave.

Defend your AI capital against endless alien invasions in this space shmup-inspired tower defense with roguelite randomness. Dissect bodies and ships to unlock weirdly powerful tech. Upgrade your base with turrets, turning your screen into a symphony of perfect destruction!

Stranded in Starlight is a top-down roguelite where you pilot a spaceship armed with a variety of unique weapons and utilities. Battle relentless enemy hordes and powerful bosses as you upgrade your ship, adapting to each challenge in an ever-changing fight for survival.

On an alien world, you must defend yourself in this unique base-building tower-defense game. Build a base by placing blocks, turrets and traps in order to survive the hoards of aliens.