Top similar games like Alien Siege: Earth:

AREA WARS™ is a fast-paced 2D omnidirectional shooter where you battle enemies from every direction in a constantly changing enclosed area. Defeated enemies trigger chain explosions that engulf nearby foes and boost your score multiplier. Built for short, repeatable runs with score-focused gameplay.

Defender's Squad is a sci-fi vertical scrolling shooter 2D that combines 7 different levels. Play Solo and pick one of the 3 ships to kill enemies and save the earth from aliens.

Defend Spacebase 19 from the asteroids swarming down on the station! Shoot down waves of stones and equip different powerful weapons. How many waves can you last? A simple nostalgic retro arcade turret defense shooter.

WE HAVE ALIENS, YOU DON'T—Blast Martian invaders and flying saucers across 30 stages with robotic voice effects. Use your destructible shield, rescue army men for bonus points, and chase the high score.

Frantic 4-player laser ricocheting top-down shooter. Keep it casual and enjoy the chaos, or master the surprisingly deep mechanics to obliterate your enemies. Duke it out locally in free-for-all or 2v2.

Fuel is life. Survive relentless alien swarms in this fast-paced arcade shooter featuring auto-targeting weapons, deadly terrain navigation, and score-chasing chaos.

A 2D vertical shoot 'em up that lets you upgrade your ship with an insane amount of options. From missiles and pods to specials and shields, you can upgrade every bit of your ship from guns to thrusters.

This is a retro space shooting game, where you only fight against the strongest enemy. There are 15 unique bosses in the game, and players need to use different weapons and strategies to defeat them. Dedicated to you who are both challengers and retro game lovers.

Repel the humans! Safeguard the future of all alienkind! Fueled by a large selection of quirky upgrades and power-ups, strengthen the alien alliance to destroy Humanity's Last Hope in this fast-paced retro action-arcade shooter with roguelite and tower defense elements.

Collection of a few arcade classics, remade with a fresh and friendly looking art style and a beautiful soundtrack.

Repel extraterrestrial entities!

In the vast depths of space, lies a man with a dark past. Setting himself apart from that old life, and seeking justice against wrongdoing instead of being the cause of it, Captain Righteous uses the Freedom Fighter, his trusty space fighter to search for and combat the evil Captain Buster!

A retro-inspired 2D space shoot-em-up. Mine asteroids! Shoot alien saucers! Get rich or die flying!

Help Haru defeat the armada of the astral void in a fast-paced roguelite retro space shooter.

Dwarf Star: 16 bit inspired game where mercenary go shoot shoot on evil alien guys who were accidentally fabricated by the government. Top down space shooter with a mission based structure. However, you can do these missions in plenty of different orders with different amounts of upgrades.

Blast your way through enemy territory and level up your versatile arsenal of high-tech weapons in this handheld game style retro shmup!

Blue Jay Joyride is a fast-paced 2D space shooter. Go through waves of enemies and fight progressively harder bosses. Collect one of the many unique powerups to give your ship a fighting chance in this intense game.

Chaotic boss-rush, bullet-hell-y, twin-stick arena shooter mayhem! Dynamically changing arena forces you to be vigilant: Watch the bullets, watch the walls!

Stop the Saturnians is a shooter inspired by classic arcade games. Dodge enemy fire, destroy procedurally generated alien waves and fight massive bosses. Collect resources in the midst of combat to upgrade your ship or improve Earth's defenses. Protect yourself and the planet both!

You've been dropped into enemy space. Weave your Starfighter between alien spaceships, lasers, asteroids and bombs destroying as many as you can and collecting valuable coins and powerups as you go.

Join Captain Rijk as he attempts to escape from the clutches of one of the most villainous species in the galaxy. Help to uncover the horrors that are being carried out on the fringes of the civilised galaxy and become the divine being prophesised to inspire an uprising and destroy The Domain.

Irradiant Skies is an arcade roguelite blending brick-breaking and bullet-parrying combat. Reflect enemy attacks, chain powerful upgrades, and master unique ships as you ascend through waves of enemies.

Punch through the cosmos! An arcade-inspired shoot-em-up where you play as an immortal lobster speeding through space.

Are you ready to command a range of different units as they battle aliens in a mission-based take on the classic Snake? Select your path to victory!

Blast aliens to pieces and start a rebellion in this fast paced pixel art top down shooter where sprinting kills.

Ever played a difficult shmup wishing for just one more bomb? Blast to your heart’s content in Blast Rush LS, a fresh explosive experience with infinite bombs, other powerful abilities, and extra challenges that demand more than just big booms. Escaping an exploding mothership isn't easy, after all!

Alpha Force Zero is an intense top-down bullet-hell adventure that requires skill and planning. Utilize multiple weapon systems including an Auto-Turret with adjustable firing modes and unlock upgrades that you can equip in your ship to give you the upper hand. Dodge, fight, survive!

Engage in an intense space shooter that you can play in single-player or multiplayer with up to 6 players. Play a variety of different spaceships, each with their own unique stats, components, and playstyles!

Pewt 'em Up! is a retro inspired arcade space shoot 'em up with lots of upgrades, achievements, extras and more.

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?

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.

Survive endless waves of escalating enemies in this fast-paced arcade shooter. Dodge overwhelming attacks, master precision movement, and fight to stay alive inside hypnotic neon chaos.

Grab the fate of all life in your hands. Blast your way through the cosmos, destroying monstrous cosmic beasts and the space cultists summoning them, on your path to stopping your mother from unleashing the chaos realm upon the universe, in this sci-fi cosmic horror bullet-hell, STARR RINGER.

Space fight arena is a retro arcade based arena shooter game that was modeled after legendary arcade games. This game retains the fun, addicting aspects of those arcade games while also adding on new, awesome features such as challenges, skins, and a world wide leaderboard.

A fast-paced sci-fi space survival shooter where you blast through relentless enemies, upgrade your ship, and climb the global leader-board.

ZEROCRON is a straightforward, classical arcade Twin-Stick Shoot-Em-Up with a strong Commodore-Amiga-era feel. Blast asteroids and enemies to burning pixeldust!