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 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. 

Fast top-down space shooter with varied missions, relentless enemies, powerful ship upgrades, and most importantly, fire.

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.

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.

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.

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!

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.

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

Repel extraterrestrial entities!

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.

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.

Shoot Until You Rest is an arena-shooter rogue-lite where you can choose from a large range of weapons and other gear to fight your enemies. Survive waves, fight powerfull bosses and get rewarded with new upgrades and characters(yes you can play the bosses).

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.

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.

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.

A fast-paced addicting space shooter with an inspiration taken from many modern games. A project I have been passionately working solo for 2 years+!

Clear hordes of cosmic critters in this simple 2D shooter but be carefully, bullets that exit the arena will warp behind you and become dangerous to you ship. Whatever goes around comes around.

Command your ship in Conqueror Of The Galaxy, an intense roguelite survival and bullet hell game. Face relentless defenses as you conquer entire galaxies, overcoming swarms of enemies and choosing strategic upgrades to become the ultimate conqueror!