Top similar games like Add Astra:
Add Astra $2.99
Add Astra is a math game about racing, and a racing game about math, developed by Coincidence. You’re the best arithmetech racer on Earth. But what about everywhere else?
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Pit Blocks 3D$19.99
Pit Blocks 3D is a cube-matching arcade style puzzle game where you manipulate falling bricks of different shapes and sizes. The goal is to stay alive as the speed increases over time – and to rack up as many points as possible before the pit fills up with bricks!
Signs of Life$9.99
Signs of Life is a sci-fi survival sandbox platformer with a combination of procedurally generated and hand-crafted content. You'll explore mysterious locations, Mine blocks for resources, and meet strange (and some familiar) creatures, some of which don't even want to kill you and eat your corpse.
Nibiru Voyage$3.99
Nibiru Voyage is a classic scrolling game with weapon upgrades and hordes of enemy ships.
Galactic Missile Defense$1.99
Galactic Missile Defense is a shooter and tower defense game, where you must protect Earth from the invading Martians that declared war on our planet just because a space rover accidentally ruined their picnic!
Molten Armor$9.99
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.
Portal Journey: Portarius$2.99
Open a portal and begin your journey! Teleport rocks, water and your spaceship. Immerse in handcrafted colorful worlds, solve puzzles and be the first at the center of the Earth.
Space Colonizers Idle Clicker$2.99
Space Colonizers is a simulation and strategy idle game of Sci-Fi adventure theme. To explore more planets and meet cute aliens, you have to constantly install parts and upgrade spacecraft.
Zack Y$4.99
Zack Y is a 2D Old School Scifi themed platform action game based on the story of the Alien called Zack Y whose mission is to rule over the Earth.
PUFIWEHO$0.99
Protecting Us From Incredibly Worrisome Extremely Hostile Oddities...is what you will be doing with your football! Defend the Earth from the invading disciples of the Deranged Octopus, and learn the ultimate secret of the Universe.
Extinction Eclipse$9.99
You are in command of the human fleet, searching for asteroids to mine, extract resources and build bases and more ships to defeat aliens invaders. This simple and short action RTS has a full and exciting campaign, and a skirmish mode that allows you to play a different mission on every match.
Space Survival$6.99
This is a post-apocalyptic survival game that combines tower defense, survival, strategy, and random events. The game atmosphere is fun, and there are many wonderful props waiting for you to discover. Every decision you make will affect subsequent development. Live by your wisdom,
Martian Invaders$0.99
A New Retro Classic Space Shooter Arcade Game. Defend Earth from waves of martian invaders and flying saucers in this modern version of a space shooter. Go Back to the 1980’s and Blast these Martians Back into Outer Space!
Asteroid Core$0.99
You are isolated on a small meteor and need to build a fire to escape before being destroyed by aliens. Use your limited space to create machines and obtain more and more resources. Enjoy this mix of puzzles, tower defense and incremental gameplay.
Cowpocalypse$1.99
An arcade style game, abduct cows to increase your score!
I'm lost in space$3.99
During a routine space expedition, astronaut Julia is thrown into a dangerous, unknown galaxy. Isolated, she faces hostile aliens and uncovers mysteries of lost civilizations, using all available resources to survive and find her way back to Earth and her children.
Revenge of the Titans$19.99
The ultimate mash-up of Real-time Strategy and Tower Defense!
Galactic Civilizations® I: Ultimate Edition$4.99
Galactic Civilizations is a space based strategy game in which you are in control of humanity's destiny.
Beware Planet Earth$4.99
Beware Planet Earth! is a beguiling mix of classic tower defense and time management coming to PC via Steam for the first time. Save your cows from the Martian invasion by building an effective defense using towers, traps and objects, and also by firing your Zapper directly at the invading force of little green men!
Captain Forever Remix$9.99
Can you create the raddest spaceship? Captain Forever Remix is the spaceship builder roguelike. Voyage across the Solar System and blast apart randomly-generated enemies for spare parts. This is an officially-licensed re-imagining of the indie classic Captain Forever.
Solar War$4.99
A turn-based grand strategy game in space, set in the near future: Defend Earth against an alien invasion from the edge of the Solar System and expand your campaign to push them back to their base.
Halcyon 6: Starbase Commander$14.99
Halcyon 6: Starbase Commander is a retro space strategy RPG with base building, deep tactical combat, crew management and emergent storytelling.
Too Angry to Space$4.99
Do you miss the times when games were not holding your hand? When they did not forgive mistakes and controls and rules were clear and simple to learn? YES? So you miss the 90s!
Space Hit$0.99
On SPACE HIT you finished your space mission, and it's just time to come back home, but your journey will not be so easy as you think...
Space Drift Squad$0.99
Call your friends and lead your squad through the outer space and protect your planet from asteroids and alien ships on this local shoot'em up. Shoot, evolve e explode these space enemies.
Desert Child$11.99
You are a hungry, young hoverbike racer who needs to get off Earth before it E-X-P-L-O-D-E-S. Hunt bounties, throw races, and do whatever you can to get to Mars and win the Grand Prix.
Trap for Winners$7.99
A gripping sci-fi interactive thriller that lets you shape your own character and his morality. YOU make the choices – and suffer the consequences!
1000 days to escape$4.99
Only 1000 days left until the end of the world. You have to realize the largest space program ever to save as many people as you can. Explore planets, colonize them, help people find a new home.
Earth Attack$2.99
Tragedy strikes as aliens attack Earth. You're left alone to pilot the last remaining spacecraft on its way back to Earth from Mars Colony. Avoid missiles, asteroids, enemy ships, and more as you accumulate high-scores in Earth Attack! Can you survive long enough or will you perish?
Apsis$0.99
Survive as long as possible in this hardcore Arcade Throwback. Avoid Asteroids and the Planets while collecting as many water filled Comets as possible!
Chicken Invaders UniverseFREE
A deliciously addictive core of finger-blistering shooting action, surrounded by delectable morsels of galactic exploration, spacecraft customization, and community competitions.
Invader TD$2.99
Invader TD is a side scroller tower defense, where the player is in the role of an alien race with the purpose of infecting and dominating the earth, you must protect yourself from the attacks of the humans, who are trying to destroy you.
Mud River$5.99
Mud River is a horizontal 2D Shoot‘em Up game. The Rio Doce (Sweet River) was a paradise for mankind and animals, but now it has become a territory destroyed by the unscrupulous activities of Dr. Wellin. This is Pacal's first destination, ascending the Rio Doce preventing its complete destruction.
Invasion: Neo Earth$8.99
Retro turn-based strategy in a sci-fi world of sinister alien invaders. Take command of troops, tanks and aircraft as you position your units for the perfect strike or unbreakable defense. Plot the course of humanity's war against the insidious Sectyd by choosing which missions to fight.
Jump Lanes$14.99
A science fiction turn based game about shipping lanes in space. Make wild profits by getting to the best opportunities first.
Where is Earth?$6.99
Where is Earth is a top-down vehicular combat game. Traverse planets, evading threats and obstacles, in search of your crew. Gather resources to assemble upgrades, landing vehicles, space craft, weaponry and support modules to aid you in your fight against an unknown enemy.
SolitariusFREE
Solitarius is a 2D top-down wave shooter set in a sci-fi space environment. It is a free minigame that contains six different levels, eight different enemies and nine different weapons. Instead of surviving as long as possible you have to make it through each level.
Invasion From SpaceFREE
Simple remake of Space Invaders adding destructions and physics
Digital Eclipse Arcade: Invasion of the Buffet Snatchers$4.99
Rude aliens have arrived to sample Earth's legendary all-you-can-eat buffet, and they're sending a smorgasboarding party down to YOUR dining room. Can you assemble and deliver their plates of food before the aliens wreck the restaurant?
Space landing$1.99
indie adventure game topdown puzzle pixelart gameboy retrògame pixelart Make your way through the pitfalls to retrieve the navespace battery and return home.
Gravarior$4.99
Gravarior is a shooting action puzzle game in which the main character, Graver, who can manipulate gravity up and down at will, tries to steal the energy hidden in the depth of a discarded ship. The ship is filled with obstacles and mysterious creatures such as Anoi. Let's overcome the difficulties!
Hamboy : AutoChess Survivor$3.99
Hamboy is a rogue-like arena shooting game where you fight against aliens by strategically combining 12 attributes and 10 types of weapons to create synergies. As the waves increase, you'll realize that you shouldn't spend gold recklessly.
GAIA Survivors$2.99
Control a variety of robots and destroy invaders from outer space in order to save the destroyed earth! "GAIA Survivors" is a 'Shoot 'Em Up' type sci-fi rogue-lite casual game with a retro-futuristic worldview.
UFO Taxi$4.99
Stranded on a futuristic Earth, you and your alien pals need cash to get home! Explore a vibrant 2.5D world, tackle zany taxi missions, and assist quirky characters in this casual platformer. Can you hustle your way to a stellar escape?
Miner Vidis$2.99
Robot Miner Vidis. Return to Earth with a mysterious gemstone on Mars, where asteroids crashed. A classic color-based puzzle where simple rules, different strategies, and order matter.
iBomber Defense Pacific$5.99
iBomber moves to the Pacific as you fight a whole new enemy across the Pacific rim to regain freedom.
Heat Signature$14.99
Heat Signature is a game from the developers of Gunpoint where you break into spaceships, make terrible mistakes, and think of clever ways out of them. You take a mission, fly to the target ship, sneak inside, and make clever use of your gadgets to distract, ambush and take out the crew.
GalaxIverse$0.99
GalaxIverse is a top down fast paced vertical blastathon, Battle Fleets and formations of aliens with the occasional boss thrown in for good luck.
Starlight Explorers$5.99
Master physics in one compelling physics puzzle after another. Aim the launcher and adjust its power, using your understanding of gravity wells to correctly plot their courses in a variety of challenges. Complete a light-hearted story and then test yourself in the endless Expeditions mode.
Marble Age: Remastered$9.99
Marble Age is a turn-based historical strategy where your task is to turn a small Ancient Greek village into a flourishing Polis, powerful enough to conquer the known world!
Zombie Solitaire 2 Chapter 2$8.99
Your crazy survival odyssey continues. Play your cards right and use your sugar ammo wisely to escape from the zombie epidemic!
Baptism of Fire$6.99
What at first was just another ranger duty, becomes the duty of champions trusted to protect the whole country's safety. In a race against time and against the former Champion Jorgen, Zasker and his party must secure all three Volgaia Shards to save the country from total ruin.