Top similar games like Thetawave:

Beat up planets in Asterogues, a cosmic bullet hell shoot-em-up hybrid! Pick your character from a band of outcasts banished to the Asteroid Belt, dodge and shoot your way through a brutal onslaught of bullets, and take revenge against the Solar System!

Beyond Lost Planets is an intense Roguelike Dungeon Crawler Bullet Hell. Fight through enemies and bosses across procedural worlds. Everything from weapons and bullets to powerup and companions is represented with cards. Grow absurdly powerful and create wild, unique synergies every run!

Control the ball with gravity and smash through endless hordes! Collect weapons and skills, power up to the max, and survive the onslaught!

Consume the civilization of the fools who unleashed you upon the universe. Become the Empire Ender.

A【Pixel style, rouge、type horizontal、 shooting、 defense 】 game

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.

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 broke bounty hunter. A sarcastic robot. 1,000,000 credit debt. Star Scrap is a chaotic twin stick space roguelite. Blast through increasingly difficult waves of enemies to pay it off.

Dungeon Souls is an action-adventure roguelike dungeon crawler which draws heavy inspiration from Nuclear Throne, Risk of Rain, and Overture. Explore vast procedurally generated dungeons, collect loot, and slay hordes of challenging enemies!

Dungeon Sucker is a 2D roguelite shooter. For the upcoming dungeon inspection, the Demon left for her summer vacation and entrusted the cleaning to an agency. Armed with the “Mighty Vacuum,” you can absorb anything that stands in your way. Clean up the chaotic dungeon—if you can!

Sci-fi rogue-like mining/tower defense game. Mine through a procedurally generated world to discover artifacts. Defend your spaceship from waves of enemies. Discover and spend resources to improve your mining and spaceships combat ability.

A rogue game aimed at delivering a thrilling experience, crafting a powerful genre, and pushing forward to the end!

The game is set in a dark pixel fantasy world. Destroy hordes of monsters ruling over what once was a prosperous land. 10 levels filled with various enemies await, you, each requiring a different approach to defeat. Like in any RPG, leveling up is the core element of the game

Heat Signature is a game from the developers of Gunpoint where you break into spaceships, make terrible mistakes, and think of clever ways out of them. You take a mission, fly to the target ship, sneak inside, and make clever use of your gadgets to distract, ambush and take out the crew.

A fast-paced bullet heaven action roguelike set in a futuristic arena. Face overwhelming enemy waves, evolve your build with powerful upgrades, and survive escalating instability that constantly reshapes the battlefield.

SURVIVE the swarm in this rogue-lite + survivors + asteroids mashup! Exterminate as many alien drones as you can. Upgrade your ship from the crafted deck of equipment and power-ups. You are the Last ship against the Endless... Will your choices be enough to overcome the thousands hunting you?

A fishing shooter game where you reel in targets to shoot while dodging enemy bullets! Build diverse strategies using active skills deployable during battle and passive skills that constantly activate!

Blast your enemies! Create the ultimate build! Travel to the edge of space, in this epic rogue-lite action packed bundle of chaos inspired by slay the spire & FTL.

A Roguelike multiverse adventure ruled by an unseen godlike being. Your life and death are part of its game. Travel across nine wildly different worlds, gain powerful skills and bloodline upgrades, and evolve through each cycle of death and rebirth.

Regulators is a tactical top-down shooter where you lead a team of mercenaries to clear the city from mutating villains using your weapons, gadgets, special super powers and intelligence.

BroodStar is a classic arcade shmup with roguelike elements. Acquire crazy item combos, encounter strange events and fight challenging bosses on a quest to destroy the living planet, the BroodStar.

Cards and Guns is a top-down arena shooter roguelite, where you’ll have to defeat hordes of creatures. Choose from a variety of cards and upgrades to create unique builds and survive to the end.

A space action-adventure unlike any other: navigate your spacecraft through a galactic-scale mystery. Make sure to loot, craft and upgrade your space fleet. Play the story campaign or test your skills in vicious arena modes against AI opponents.

Weaponized is a fast, violent retro vector shooter. Use your machine gun to carve through asteroids and extract ore. Grab and hurl enemies, snipe through rocks, fight massive bosses. Make your quota and get out before it's too late. Earn. Endure. Weaponize.

Danger Gazers is a post-apocalyptic roguelite top-down shooter where you pave your own path. The choices you make will decide your fate, it will either turn you into the new ruler or... the ashes to be windswept away.

Put together experimental weaponry to fill the screen with bullets and defend yourself from endless waves of foes

Microbes and Machines is a roguelite action game where you control a little bubble robot that fights against the forces of evil.

Take up your weapon in this RPG bullet-hell world and embark on a journey to right wrongs from long ago. Only you can defeat the evil forces of the Undying guardians and reunite the world with the fabled Archvale.

Nuclear Throne is a post-apocalyptic roguelike-like top-down shooter. Not 'the final hope of humanity' post-apocalyptic, but 'humanity is extinct and mutants and monsters now roam the world' post-apocalyptic. Can you reach the Nuclear Throne?

Aboard your ship, destroy the hordes of aliens attacking you by choosing your weapons and upgrades as you play, and defeat the final boss! In this roguelite, each ship has a different weapon layout, giving each one its own unique playstyle. Then create your ship and develop your own strategy!

A brutal mix between dungeon-crawler and shoot-em up. The dungeon will learn from you and become more dangerous every time you play!

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?

Rustwing is a twin stick shooter roguelike, set in the distant future. Navigate from star to star, battle the scattered factions of humanity, discover strange anomalies, customize your weaponry, acquire powerful upgrades and become a legendary pilot!

In Astrum Vanguard, a 2D horde-survival with bullet hell components, you pilot and upgrade your spaceship to defeat countless alien creatures. Survive the endless onslaught in the cosmic battlefield!