About This Game

New Mode: Core Siege

No turrets, only the core. Type a string of arrow keys and the core transforms into a weapon on the spot, shattering the incoming meteors. Each of the 17 weapons has its own parts and sounds; unbroken correct input raises overload, and at the top tier the weapon switches to a stronger form. Unlocks after Chapter 2.

The First Missile

A city-killer asteroid is falling toward your city, and all you have is one missile silo. Destroy the incoming threats, earn money and upgrade your firepower. Your defense starts in the sky ten kilometres above the city.

Turn the Cosmos into Weapons

Rooftops, the Moon, the Sun, Jupiter, a black hole… all 50 celestial bodies in the game can be converted into weapons, each with its own attack. The Sun is wrapped in a Dyson sphere, and the black hole at the galactic centre becomes an engine.

More Firepower

Every chapter unlocks a main weapon with a whole new attack: missile salvos, kinetic rods, gravity wells, pulsar beacons, quasar jets… with up to 48 turrets firing alongside.

Defense Circuit

Upgrade through a circuit board, lighting up chips to unlock new mechanics. There are even elemental reactions.

Ten Ultimates

Droplet

Fourier Decomposition: everything the pen tip passes detonates.

Mandelbrot

Ten Bosses

Every chapter has a giant threat: a city-killer asteroid, a magnetar, an alien megastructure warship, a cosmic catastrophe core… each with its own skill and energy layer. Interrupt its skill while the boss charges up, and click the boss's weak points to focus all your firepower and destroy the boss before time runs out.

Difficulty That Builds Step by Step

The Bastion throws a shield over the enemies around it, blocking most of the damage for them.

Ten Scales

City → Earth → Inner Solar System → Outer Solar System → Oort Cloud → Stellar Neighbourhood → Milky Way → Supercluster → Observable Universe → The Brane. Finish a chapter and your defense jumps with you to the next scale.

Star Chart and Doom Levels

The score you earn each run is called Afterglow, and you can spend it on the Star Chart for permanent upgrades. Every victory unlocks the next Doom Level, up to level 10.

Beyond the Universe

Your Pace

• Pause anytime, ×1 / ×2 speed
• Autosave with Steam Cloud
• Steam Achievements
• 11 languages, including English and Simplified Chinese
• Journey of Scales chapter select: replay any chapter you have reached on its own
• Screen effects adjustable one by one: CRT curvature, scanlines, colour fringing, glow… or back to the original black and white in one click
• Accessibility: turn off camera motion, reduce effects, separate music and effects volume
• Fully playable with just the mouse

AI Generated Content Disclosure

The developers describe how their game uses AI Generated Content like this:

Generative AI was used to assist with writing and translating store descriptions. The game does not use generative AI during gameplay or generate AI content in real time.