Top similar games like ProtoGalaxy:
ProtoGalaxy FREE
Earth is under siege! A mysterious and powerful alien race has come to enslave the entire galaxy, and your fleet is humanity's last hope. You must put an end to the attacks and rebuild a home for the survivors.
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The Riftbreaker: PrologueFREE
The Riftbreaker: Prologue allows you to experience the events taking place before the story campaign of the main game. Explore an entirely new world. Gather resources. Build up a base. Defend yourself from thousands of alien creatures.
Faith & Shield:4044 Tower Defense$4.99
Faith & Shield: 4044 Tower Defense game, where you protect the human settlement from the incoming invaders, robots and other creatures, never seen before on our planet.
Lazy Galaxy: Rebel Story$4.99
Start a Rebellion! Lead your ships to take down the evil O'Xelg base in this squad-based shoot-em-up!
Ghostship Aftermath$9.99
Ghostship Aftermath takes survival horror to a new level with random events and multiple story-lines. Your survival skills will be put to the test on a huge open-world military spacecraft with limited light and oxygen as you struggle to discover what happened, and fight to stay alive!
INVASION OF THE BOX PEOPLE$3.99
Destroy box shaped aliens before they can kill you! Outside of basically shooting the invading boxy aliens dead, you can also knock them into each other to create a powerful-yet-comedic “domino effect” – and when all else fails, pick up upgrades to boost your firepower.
Planetaries$19.99
Experience a vast Sci-fi open-world survival TD game set on a distant planet deep in the universe. Craft, build, mine, trade, explore, and survive in this alien world. Collect Data and defend against waves of enemies seeking to banish you. Enjoy the adventure in Singleplayer or Multiplayer.
Anomaly: Warzone Earth$9.99
Lead an armored squad through the perils of this reversed tower defense action-strategy game!
PixelJunk™ Nom Nom Galaxy$9.99
Welcome to SoupCo, Astroworker! In Nom Nom Galaxy, construct and automate gigantic soup factories on unexplored planets throughout the universe, harvest flora and fauna to turn them into artisanal soups, and rocket your product into the gullets of the galaxy!
Anti Air$12.99
Are you the new recruit? Well, grab your weapons and descent into battle on distant planets. There you will combat the Alien invasion called the Cubicon Conjunction. Waves will hit you so you better blast these invaders from the sky before they crash onto your base.How many will you take down?
CDF Ghostship$9.99
CDF Ghostship is a science-fiction Old-style shooter featuring an open-world spaceship, space station and colony. Each new game will offer a challenge with random story-lines and narrative, random enemies and multiple endings. Can you escape the Ghostship?
Bass Invaders$14.99
Infinite Rhythm Action. Join Ace and PZO-116 as they repel alien invaders whose only weakness is music. Battle using any song from local files or online video with automatic beatmap generation. Nail the perfect run and top the leaderboard on your favourite tracks. Your music will save the world.
DERE EVIL EXE$2.99
DERE EVIL EXE is both a terrifying thriller with a gripping meta horror story and a retro 16-bit pixel platformer with unique puzzles and obstacles.
Proto Akane$1.99
Akane pilots a vehicle that transforms to have different abilities to advance and defeat her enemies.
Proto Raider$11.99
Proto Raider is a single screen auto-running puzzle platformer covered in ASCII beauty.Immerse yourself in this colorful and imaginative world. Ride waterfalls, fly into tornadoes, solve puzzles, and fight monsters to complete quests and collect your treasure!
Gluon$3.99
Earth is just got destroyed! You are heading to the endless space with your modular ship on which the tens of thousands survivors boarded.Gluon is a combat, survival and exploration game with space battles featuring massive numbers of ships. Your modular ship expands its ability and capacity by linking various modules.
Beyond the City VR$1.99
Beyond the City VR is a Tower Defense game in VR environment. Come to play as a warrior/commander (2 roles in 1 player) to beat the invaders, exploring the different strategy and static to flight against the enemies, till the last victory. Update to V0.4 @ 2017.04.24
DOTFI$1.99
Do you have what it takes to defend what is yours? This is not a typical tower defense game where the troops do all the work. This is a hybrid FPS/TPS tower defense game which you take over the control to defend your island.
RefleX$7.99
The second chapter in one of the most loved and respected Japanese shooting game series ever:The Tale of ALLTYNEX by Japanese indie developer SITER SKAIN. Carefully crafted play experiences, destructive fun, and absorbing gameplay have made the ALLTYNEX trilogy renowned in shooting game communities.
Fortitude invasion$7.99
The alien invasion has already begun! They're already here! Who can help the brave warriors to learn the full power of our civilization!?
Orbit: Satellite Defense$3.99
Protect your planet from alien invaders in this unique RTS experience. Freely reposition Satellites and manually dictate their targets. Manage your Energy reserves to send Satellites into orbit or unleash Planetary Powers.
Serious Sam 4$39.99
Serious Sam 4 reignites the classic FPS series in a high-powered prequel loaded with an explosive arsenal, intergalactic carnage, and perfectly timed one-liners.
Alien Kingdom$4.49
Alien Kingdom is a first person city building and strategy game that weaves medieval and sci-fi atmospheres. You'll go adventuring and find villagers you can escort home to help expand your kingdom, and construct utility buildings like farms, houses & resources buildings, defensive structures like gates, towers & walls, and unit...
四魂-X Shikon-X Astro Defense Fortress$9.99
Shikon-X is an intergalactic point and click adventure without any actual pointing or clicking! Set out on an epic quest to unravel the mysteries behind the war against humanity. Even when pitted against a cosmic threat, there’s always time for a bit of pinball.
Planetary Defense: An Orbital Turret Defense System$1.99
2D space shooter and turret defense come together to create the Planetary Defense System this world needs! Shoot down asteroids and aliens and survive the bosses in this arcade like game featuring customizable satellites, projectiles, and upgradable Cannon and Planet Shield systems.
Serious Sam VR: The Last Hope$29.99
Serious Sam is back! And this time it's REAL!
PLOID SAGA$11.99
Ploid is a new platform adventure game for old or modern hardware, play and explore the lost temples, gain sacred disc files and become the ultimate Ploid X of the galaxy! + V.O.I.D. Definitive Edition
Gunhouse$6.99
Load your guns! Rain death from above! Protect your valuable orphans! Defeat giant, improbable bosses! Gunhouse is part puzzle, part active tower defense, as you make big combos to launch a hail of bullets and special attacks at the enemies who want to consume your delicious orphan friends!
Defend Earth: Xenos Survivors$4.99
You are Earth's last line of defense in a relentless alien invasion. Experience intense top-down roguelite action across diverse landscapes, fighting invaders with a versatile arsenal. Outsmart, outgun, and survive your foes. Every run increases the challenge - so adapt, evolve, dominate!
Аlien cat 4$2.99
The game takes place in a nearby galaxy where a fighter with intergalactic evil in the form of a black cat has settled down
Fortified$14.99
Fortified is an explosive strategy shooter where players will defend the Earth against a menacing Martian invasion in the 1950s. Play as one-of-four pulp inspired heroes as they fight swarms of terrifying robots with an arsenal of Cold War era weapons and experimental technology.
Primordium - Day ZeroFREE
Fight for survival in a sci-fi RPG! Take control of the Nexus' Commander and gather companions to grow your team, build bases using a vast array of AAA quality models, and customize your arsenal using countless combinations of modular attachments, items, armor, and weapons!
Dreadnought Sol$3.99
Fight through procedurally generated scenarios and unlock every ship. You are in the last Sol Defense Force's Dreadnought fighting for survival. Humanity has been flushed out of known space by alien resistance who oppose humanity's industrialized growth, it's your job to take it all back.
Close Order$4.99
Close Order is an arcade shooter with one simple goal: become a badass armada! In this mashup of genres, defeat enemies for parts to build up an armada of ships around you. Fight from a distance, charge headfirst into battle, or create a mix of anything and everything. You decide how to play!
SpaceFrog VR$4.99
SpaceFrog VR is a room-scale retro shooter: You are Princess Gero, warrior pilot. Destroy the Klurxon invasion or SpaceFrog civilization is doomed! Dodge obstacles by moving around your capture zone; punch to fire rockets. Story mode and endless/arcade mode for limitless fun!
Space Raiders in Space$9.99
Space Raiders in Space is a wave defense roguelike mixing squad management and tower defence mechanics. Command your almost competent crew to loot weapons and supplies, build defenses, and fight their way through the Bugpocalypse.
群星战纪: 最终防卫线 - STARS ERA: THE FINAL DEFENCE$0.99
We will be the last guardian of the planet, here will be our final line of defense. The Clyde Star Spaceguard will fight to the last moment.
Wander VyrosaFREE
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!
Galactic Slice$2.99
Galactic Slice sci-fi shooter game all about pizza, you use the WASD keys to move & the spacebar to shoot. Galactic Slice is all about an alien race wanting to destroy & ruin pizza forever, which simply cannot happen! Your job is to eliminate the aliens & save all pizzakind.
I'm Titanium$7.99
Survival, ship modification, base defense, boss battles and player leaderboards table all this awaits you in the game I'm Titanium.
Spacebug$3.99
Embark on an interplanetary journey in this space shooter game with many levels to pass or a Sandbox mode to break your record each time you play!
Joy the Pug$0.99
Meet Joy—the sweetest pug you’ll EVER see. Help him battle the cute but deadly Space Cats and send them back to their Milk Galaxy. Don’t be fooled by all the adorableness, though. This game is not so forgiving and you have to shoot your way to victory.
Xappy Ship$3.99
In this classic retro arcade-style space shooter, you'll embark on a thrilling adventure through the cosmos, battling against an onslaught of alien invaders and formidable bosses. With its pixel graphics and pulse-pounding soundtrack, Xappy Ship is a love letter to the classic space shooters.
Incursion: Reforged$4.99
Incursion is an indie FPS that aims for a unique wave survival experience with class-based combat for both co-op and singleplayer. Fight alongside strangers or friends and take advantage of unique weapon combinations, perks, and classes to win in this solo-developed indie title.
HANZ!$4.99
Fight with crowds of enemies, repel attacks with turrets, defeat invulnerable bosses in the new top-down shooter HANZ!
Chaos Brigade$0.99
Chaos Brigade is a 2D arcade shooter where you control a team of six space exterminators and lead them in the ultimate space cleanse. Wipe out the enemies with your arsenal, but don't overdo or you'll risk destroying the spaceships you are meant to save!
Island Defense$1.99
Get ready for modern battles! Defend your islands against evil invaders in jungles! Your team will consist of modern snipers, gunners, rockets, ice towers and other great things. A deep conflict has been brewing between you and the evil invaders. Fight to protect your freedom and liberty.
Rogue Stargun$9.99
Rogue Stargun is an action-packed space combat sim where you pilot 5 unique starfighters with interactive VR cockpits in a story-driven single player campaign consisting of over 24 unique missions covering both land and space.
Orbital Defense Force$9.99
Orbital Defense Force (O.D.F) is a multiplayer shoot 'em up co-op rogue-like game. play as mercenaries working for the O.D.F., accepting contracts to defend planets from invaders and earn precious scrap that can be used to upgrade their ship to take on more difficult contracts.
Dig or Die$11.99
Crash land on a hostile planet where you'll have to build the strongest defenses if you wish to live to escape from it. But be warned... this planet is merciless. Build strong, and smart; else physics may flood or destroy your only hopes of survival.
SBX: Invasion$1.99
SBX Invasion is a tower defense and base building game. You pilot a ship that can build defenses and must fight off alien invaders in each stage. Quickly build defenses and towers in each stage before you are overrun by enemy forces.
Satellite Repairman$1.99
All the planets in the system have suddenly decided that the galaxy isn’t big enough for all of them! You’re not sure who launched the first missile and it doesn’t really matter! You’ve got nothing to do with it… you are just… the satellite repairman!