Top similar games like Ostallian Core:

Face the relentless legions of hell in this fast-paced top-down roguelike. Loot powerful weapons, level up your stats, and survive the bullet hell chaos. How long can you stay alive in the inferno?

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.

HYPERDRIVE is a fast paced Sci-fi action flight sim, combining the infinitely looping gameplay of a roguelike, along with the combat and controls of classic spaceship combat. Avoid obstacles, and take down enemy ships in high speed space combat, all while making as many deliveries as possible!

A space station, infinite waves, and a screen full of vector geometry trying to kill you. Your turrets auto-fire. Your satellites orbit. This is bullet-hell-yeah. In-game and permanent upgrades. 17 upgrade types across 9 weapon classes. Play, upgrade, repeat.

Gospel of Abaddon is a 2D mix of RPG, Shooter and Roguelike. During WW2, an American pastor deserts the army and after using amphetamine, he sees God telling him to destroy the entire sinful world...

Survive in the deep void of the galaxy against thousands of invaders! Nebula is a challenging bullet hell, twin stick shooter where you have to face endless waves of space enemies. Additional map resources and space drones can provide you a support but be wary, they can as well become a deadly trap.

Destroy hordes of strange machines that have invaded the forest. Yawnoc is a chaotic top-down shooter roguelite focused on immersion into the world of Conway's Game of Life and other cellular automata.

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

Dodge, shoot, survive! Polygon pursuit is an arcade-style twin stick shooter where you are pursued by multiple enemies constantly. You play as a lone circle confined in a polygonal world fighting to survive against waves of unique enemies. This is not an easy game.

With easy-to-master controls, a simple objective, beautiful top-down 2D graphics and an 80’s arcade game spirit, FINAL PILOT is an online multiplayer battle royale set in the deepest reaches of uncharted space.

An indie story-driven space shooter with intense battles, escalating enemy waves, and massive boss fights. Choose and upgrade ships, unlock powerful weapons, and protect your allies. Upgrade your base and construct a battleship to take on even stronger enemies. All set to a rock & synth soundtrack.

Prepare for an interstellar showdown like no other in a gripping roguelike top-down twin-stick shooter set in the vast depths of space. Pilot your advanced starship, engaging in relentless battles against hordes of alien adversaries. Destroy, Collect, Upgrade, Die, Unlock, Repeat.

Split Drive is a roguelite arena shooter where you have to find your way home through a hostile galaxy, numerous locations and a variety of bosses, all generated procedurally.

Collect synergizing items to create an overpowered character to fight hordes of cyclops monsters. Cyclo Chambers is a fast-paced, top-down arena shooter with light rogue-like elements. 150 items to choose from to create frantic combinations. Different runs every time.

A fleet to defeat, a weapon to collect, and one life to decide everything in the roguelike shooter No Space For All. Let the universe know your second name!

Shoot! Upgrade! Defend! In this twin-stick roguelike, protect all things bubble from infinite waves of pointy bad guys! Upgrade yourself and your base, or better yet, use a super attack, and stop everything from trying to pop you!

Stop the bogus creeps in this hardcore action roguelite! Equip rad perk based armor in five slots, wear and unlock new gnarly costumes with active and passive abilities, use tubular randomized guns, unlock tons of new ammo types and upgrade your awesome mini-mart!

Start off as a weak ship with a simple attack and fight through waves of enemies, earning currency in order to purchase upgrades for your ship. The never ending waves of enemies grow in number, power, and variety as you progress. Purchase upgrades to keep pace with them.

Mination is an arcade twin-stick shooter/survivor with roguelite and story elements. Take control of Minerva as she mines ores, avoids or fight pirates and aims for a high score! Earn space-dollars to upgrade your ship, progress the story to unlock rewards and head back to get on that leaderboard!

Sluggerpunk is a gripping 2D survivors roguelike adventure. As you navigate through a myriad of challenges, hone your skills and strategies to clash with formidable foes lurking in the underground. Build a versatile arsenal of abilities and gear to enhance your chances to survive, but will you?

Become an agent of vengeance in this bullet-heaven action roguelite! You are the lone survivor of your squad, on an alien planet with just your weapon, a jetpack, and the courage to keep fighting. Kill off alien swarms and transform their valuable guts into explosive upgrades and vital utilities.

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

Drift Shooter is an arcade game. Players control a graphic with a car control feel and collect multiple types of weapons in the scene. By combining and using such skills, they can attack waves of enemies.

Neon Fighter is a tiny arcade game packed with lasers and explosions, in which every few seconds you are forced to switch weapons automatically, making you have to adapt quickly to the new situation and re-evaluate your perspective.

Reality is collapsing into the Null, a digital void that consumes entire sectors of existence. As the last surviving pilot, you dive into corrupted space to fight through hostile anomalies, recover lost data, and uncover the force behind the collapse before everything is erased.

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!

Rocket Rats is a survivors-like game where you defeat cheese-based astral bodies in space – as a rat! Clear waves of enemies, collect cheese, upgrade your gear, and conquer the moon!

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.

Pilot an agile star fighter to tear down alien megastructures under fire, then pull off a high-stakes heist from within before everything explodes. When you die time rewinds, sending you back to Moonbase Alpha—your hub for reinvention. Spend your bounty on explosive upgrades, ready for the next run.

Ore & Ordnance is a Retro styled, Sci-fi, Bullet Hell. Survive endless waves of Pirates, Asteroids and Firestorms. Collect upgrades, complete missions and survive your shift! How long will you last?

A cozy time survival roguelite in space. You steer the shippy while the shooting happens automatically. Meet cute NPCs, solve small quests, and fight quirky enemies with satisfying weapons. A shorter experience for people who don't have much time but love playing (and finishing) games.

Broadside Renegades combines auto-firing weapons with manual ship abilities in a rogue-like space pirate adventure. Choose your captain and upgrade your ship to steal the space kings booty. Warp ahead to stay alive, and mind your bearing.

AGIS - A Game In Space is a top-down twin-stick-shooter.

Enter the Blacksea Odyssey, a violent top-down rogue-lite space shoot ‘em up RPG brimming with colossal creatures and runic technologies. Explore dangerous, interstellar spacescapes as you hunt enormous space-behemoths with a harpoon and rune-infused spears.

A Bullet-Heaven roguelike in the Approaching Infinity universe with both spaceship and away team missions. The exit of the galaxy's dominant races left a power vacuum that everyone wants to fill. Survive, pick a side, or kill'em all. No time to think when the horde's advancing.