Top similar games like Astraea:

Pulse laser battles between you and enemies.

Brutal twin stick shooter with fun and clever enemies. Also has roguelite and Sci-Fi stuff.

Battle a never ending swarm of enemies, but be sure to surrender before you die...

lone.AI is a space RPG roguelite. With challenging, relentless gameplay, each run has the potential to boost your ship's power, speed, and more. As a lone AI, fight your way through the solar system and uncover the secret behind the ZOSMA, an alien race that holds power over the system.

A cosmic survival roguelite. You are a dying star, and the rock field around you never stops closing in. Survive relentless waves, draft upgrades between levels, and save your cooldowns for when the gaps disappear. Every boss you defeat returns as a regular enemy for the rest of the run.

A linear danmaku shoot-em-up with some visual novel elements. Clear 6 stages across 4 difficult settings, each with unique enemy spawns, bullet patterns and boss phases. The game is structured to have each difficulty cleared in sequence, with the full plot unfolding across each one. 

Amazing graphics. Countless different units. An addictive Battle Pass. We have none of those things. Just one carrier and as many tiny fighters as you can muster to hold back hordes of enemy fighters and bombers. Victory is not enough - you may win the battle, but still lose the war!

Warspace is a arcade space shooter game.

A Sci-fi Shooter with Pixel-art graphics and various mechanics such as slow motion and dashing. In some levels you also get a special assistant.. You will enjoy this space shooter game. make sure you ALWAYS KILL THEM ALL.

Nebula Live is a 2D side-scrolling space shooter set in a galactic TV show where the audience controls the chaos. Fight through 13 levels as viewers vote for unpredictable events, send power-up drops, and influence your chances of survival before unlocking Endless Mode.

Space Adventures 2 in 1 is a collection of arcade-style space shooter games taking inspiration from classic arcade games. Both game modes focus on quick movement and reflexes, maintaining a retro-like feeling, featuring cartoonish sprites and sounds, and are designed for short, replayable sessions.

Get ready to Bark’em Up! Play as Bullet, a C³ class (Cute Cybernetic Corgi) pup on his quest to save his owner, a brilliant scientist kidnapped by an alien race that wants to rule the galaxy. ProtoCorgi is a retro pixel art shoot’em up with a strong arcade feel!

A top-down action game like no other. Use asteroids to block enemy bullets and smash enemy ships in this physics-based test of skill. Conquer 25 levels, vanquish 5 bosses, and maneuver through 5 tricky bonus waves.

Wellenfjord Danmaku Adventure is a 2D danmaku shooter bullet hell game, featuring minimalist arts and fast-pacing combat. Includes Campaign and Arcade.

Dark Galaxy is a fast-paced action roguelike top-down shooter. Pilot a space drone to battle an invasive insectoid species. Illuminate the darkness and grow stronger as you travel to different star systems. Can you free our galaxy from the invaders?

Choose your ship and command it against an army pitted against you in this wave-based arcade-style bullet hell space shooter. Fight for as long as you can with powerups acquired through the catalog, and blast through everything in your path.

Space Mash is a bullet-hell shooter in the retro style of the earliest arcade games. To help beginners, older players and those with a motor impairment, there are five levels of slow-down that can be activated at any time during game play.

Take control of humanity’s last resort in defending the planet from the many dangers outer space has to offer. Shoot or deflect incoming projectiles, harvest them from the moon and spend the loot on upgrades.

Repel extraterrestrial entities!

An unknown signal pulses across the edges of deep space. Drive, shoot. Dodge, destroy!

Mashup of classic arcade games.

Defend the planet from endless waves of alien ships in this retro arcade shooter. Craft the turret to best fend off the alien assault with shotgun, explosive and many more modifiers.

Survive 20 escalating stages of meteor chaos in a fast-paced 2D arcade shooter. Master unlockable weapons, face unique meteor threats and powerful bosses, customize your ship, then push your limits in Endless Mode.

A hostile force has enslaved most of the human race! You are humanities last resort to put an end to the rampant force that is taking over the world! Do you have what it takes to destroy the enemy headquarters while navigating treacherous obstacles and fighting off dangerous enemies?

fast-paced, high-difficulty 2D space dogfighting roguelite game.

Enter the galactic battlefield in this intense bullet-hell shoot-em-up! Dodge endless waves of bullets, unlock devastating powers and ships, and climb the global ranks in this addictive modern retro arcade experience.

Welcome to an epic world of endless carnage, where you battle alien foes at lightning fast speeds, and engage in mind meltingly epic boss battles. Immerse yourself in a beautifully hand crafted world, with visually stunning top down graphics and unlimited action packed levels.

Sanctum Arcadia is a game where you must fight your way through increasingly dangerous zones filled with enemies, hazards, and mystery. Sanctum Arcadia has a unique but still familiar progression system, challenging and engaging combat, all in a smooth Arcade-like experience.

Fight through relentless waves using a wide arsenal of weapons and gear. Defeat powerful bosses, unlock upgrades and new characters (including the bosses themselves). Enjoy slaying enemies in Chill Mode or take on a real challenge at higher difficulties.

Fast-paced roguelike where you mine and explore procedurally-generated asteroids. Collect unique stackable upgrades to aid you in your quest for riches! (and freedom...)

Bill's adventure: Alien war is a 2D platform game with shooting elements in which you'll fight to end an interplanetary war between robots and aliens in a futuristic world where humans have gone extinct.

Shoot, smash and explode your enemies in this space shooter inspired by the golden age of arcade games.

Free the solar system from the clutches of malevolent admirals in this sci-fi boss rush bullet hell game. Pilot your starfighter and defeat fleets and powerful battleships with your arsenal of weapons.

A top-down space survival roguelite. Harvest crystallized spacetime, build your arsenal from 40+ absurdly named weapons, and hold off increasingly hostile void entities until the universe runs out of things to throw at you. It usually doesn't.