Top similar games like Squad 51 vs. the Flying Saucers:

Squadron 51 Prologue is free version of Squadron 51. It features 3 levels of entertainment, adding English voiceovers, a never-before-seen boss, and new gadgets for your spaceship to defend Earth from a merciless alien invasion.

Jetboy is a retro supercharged jetpacking pixel shooter with a pumping metal soundtrack.

Ziggy's Cosmic Adventures is a VR cockpit game combining ship management with action-arcade combat. You play as a bounty hunter with possibly questionable morals, currently in possession of a little alien that you may or may not have stolen from the evil Empire. Do you have what it takes to survive?

Defend the galaxy from vicious space pirates! Seize your foes and fire them back at their allies for devastating destruction in Toaplan's legendary horizontal arcade shooter, now on PC with all-new features and quality-of-life bonuses!

Take back the Theed Royal Palace in this fast and furious lightsaber action game. You will have the power of the Force and your trusty lightsaber to help you ward off legions of battle droids, destroyer droids, assassins, and other creatures from Star Wars: The Phantom Menace.

A retro shooter with a new power: the power to become any ship.Lost in the depths of space, you are a being of pure psychic energy with the uncanny power to take over and control anything you see in order to survive.Built for PC, Enemy Mind lets you battle your way through 70+ waves of challenging enemies.

Swords and Their Boy is a 2.5D sci-fi souls-like action about two AI swords using a mortally wounded boy to finish their task - cleanse an alien planet before its colonization.

Sagittarius is a classic side scrolling space shoot'em up in a modern take. In this epic space game it's up to you to save our solar system from destruction. Fly alone or with a friend in a local multiplayer co-op game.

Explore and fight your way through a crashed human spaceship infested with relentless hordes of aliens as you become more powerful with exciting weapon upgrades and powerups in this retro inspired first-person shooter.

Blast through five worlds, claim the Cosmic Gems, defeat Lord Zorkannan, and master every run in this fast arcade shooter.

You have a very important mission. Be a hero who saved humanity from extinction. Fight intense battles, use all your skills and destroy all the threats that are coming to our planet. Remember, we don't know exactly what we are dealing with, be careful. You are our hope.

A top down, twin stick shooter inspired by classic retro arcade games with loads of enemies, fast paced bullet hell combat, big boss battles and tons of bullets.

Dal R’El and Gwyndala race against time to save their friends, their ship, new alien species and an entire planetary system before a supernova destroys them all, while battling a deadly new enemy that will stop at nothing to destroy the Protostar and change the very course of history! 

A wormhole has opened up letting aliens terrorize your city. Pilot your spacecraft and destroy the aliens using flamethrowers, missiles, gatling guns, shockwaves, and more!

A high-speed arcade racer where road rage fuels chaos. Smash traffic, build boost, and tear through neon highways in this Savlonic-powered thrill ride.

A fast-paced retro arcade shooter inspired by classic 1980s side-scrolling space combat. Weave through organic obstacles, survive relentless enemy waves, and defeat powerful end-level bosses in a pure, skill-driven singleplayer experience.

Retro-inspired arcade-style shooter. Save humanity from incoming waves of flaming hot meteors, alien ships hell-bent on destroying humanity, and the strangeness of space by shooting, blasting and nuking incoming waves of meteors and enemies.

Explore space and race against the clock in this retro styled adventure game.

Saturn Quest: Blast Effect is a story-driven action adventure game set in the human-less galaxy far far away. Fly, climb, shoot, explore the world and fight the giant bosses in this 8 Bit style Space Opera, full of drama and epic.

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.

Katalyst is a 2-D Space Shooter for the people who love and grew up with Space Shooters! Guide the Hero on his journey to defeat the evil aliens threatening civilization! If you like dodging bullets, precision shooting, and only being able to move in 8-directions, then this game is for you!

Survive 10 enemy stages! Shoot 'Em Up style, spaceship game, in pixel art and 8-bit retro music! Evolve your shot to the maximum level, use the energy bar for upgrades, and special abilities! Advance each stage by defeating Bosses and enemies to collect new skills, transformations and extra lives!

Escape the asteroid and solve challenging puzzles in Korlax Escape, a thrilling cartoony sci-fi game that puts you in control of a UFO. With shooting mechanics and moving hazards, retro-gamers and speed runners will love the exciting gameplay. Can you make it out alive in Korlax Escape?

Steel Saviour is back! Try yourself at this revised 16: 9 version of a cult side scrolling shooter.

Jet Gunner is reloaded, remade and refueled for a new explosive 8-bit adventure. Relive the past glory days where VHS was king, phones didn't have screens and you'd have to blow into a cartridge to get your gaming fix.

In this classic side-scrolling shoot-em-up, originally published in 1989 for the Atari Lynx handheld console, take on the role of a starship pilot trapped in a web of 51 interconnected hostile universes by the evil spider Zendocon.

Run, shoot, and destroy hordes of mutants in the definitive Thunder Hoop collection. Take on Professor Genbreak’s bio-monsters in two explosive retro platformers, for an authentic ’90s arcade experience!

Fly through the exciting skies in this unique side-scrolling platformer! Collect balloons and feathers to gain the ability of flight as you navigate dazzling landscapes and face off against surprising obstacles and enemies during your aerial journey across the world!

Fire up a wild ride across the cosmos with a fresh take on Marvel’s Guardians of the Galaxy. In this action-adventure game, you are Star-Lord leading the unpredictable Guardians from one explosion of chaos to the next. You got this. Probably.

Grab a friend and dog pile on foes in the action packed 2D adventure!

Covenant: Project Zero is a space opera set in a universe where interstellar corporations and big money interests run everything. Embark on an action-packed adventure as Captain John Covenant, accompanied by a band of rag-tag misfits, to confront the dark evil lurking in the universe.

Jump into this new battle in this new side-scrolling shoot’em-up, face enemies and obstacles from every corner of the Milkdromeda Galaxy and encounter strange fun transformations that change the way the game plays.

Dive into the heart-pounding action as MT Force, an elite government unit racing against time to unravel the mysteries of enigmatic anomalies. Rumors suggest that a mysterious scientist made contact with aliens, and now everything is out of control!

Blast through endless waves of asteroids, unlock powerful ships, collect devastating upgrades, and survive the ultimate retro-inspired arcade space shooter alone or with a friend.

The Lost Planet Zenox is inspired from an old retro game called "Thrust". You found a mysterious mineral at the asteroid belt of the Zenox Planet. But before bringing it to the earth your ship got attacked by pirates and crushed to the Zenox. Why pirates attacked and how will you get back to Earth?