Full notes
Full Arcadium - Space Odyssey update
Read the full published notes in a cleaner layout. The original post stays linked below.
What changed
- Gameplay
- Store
- Events
- Fixes
- Performance
Arcadium joins Bullet Heaven Fest 3.0 and Games In Italy with its largest update yet. Demo players gain access to a special festival-only 6th stage, while the full version introduces a major new metaprogression system: Cosmic Relics. Cosmic Relics are not available in the demo, but this update marks their arrival in the full game, soon releasing in January.
New Features & Content
Cosmic Relics Feature: Planets can now drop Cosmic Ore, a rare currency used by Rift Merchants to obtain Cosmic Relics; a powerful meta-progression items that can completely reshape Universe generation, planet types, and run-wide rules. This is the biggest system added so far.

- New StageCosmic Ore & Rift Merchants: A brand-new stage where planets begin dropping Cosmic Ore, and Rift Merchants may appear across the galaxy. These mysterious sellers offer access to the Cosmic Relics.
Special 6th Stage for Bullet Heaven Fest: Demo players can now reach a unique 6th stage crafted specifically for the event.
30+ new planets added to further broaden the variety of planets.
Complete overhaul of the title screen, now visually richer and more dynamic (and you can choose your FAVOURITE planet in the title screen!!)

The game is now available in German.
Improvements
Settings have been unified into a single, cleaner menu.
Added a button to cancel an item swap when both item slots are full.
Added an option to slightly zoom out the camera on PC.
You can now choose a planet from the planetary log to display on the title screen.
Death animation is now faster and more powerful.
Stages are now generally harder and better paced.
Improved cosmic essence drop rate.
Only ships with at least 1 cosmic essence now display the “(X/100)” line.
Text readability improved through subtle outlining.
Better looking cursor.
Planets better communicate when they’re fully harvested.
Artifacts can now be equipped with a double-click.
Added a quick confirmation when pressing “Quit”.
Removed stages that weren’t contributing meaningful novelty.
Added a Reset to Default button in Settings.
Fixed cases where a few planets couldn't be found.
Better overall polish, clarity, and UX across the whole game.
Neptune bullets are now faster, as originally intended.
Bug Fixes
Fixed an issue where Nova Sentries duplicated when resuming a match.
Fixed a bug where a match could not be continued.
Fixed an issue where cosmic essences could be farmed by repeatedly resuming matches.
Various fixes & stability improvements.
Don't forget to add Arcadium to your wishlist, if you didn't: [dynamiclink href="https://store.steampowered.com/app/2352670/Arcadium__Space_Odyssey/"]
Source
Changelog.gg summarizes and formats this update. Original post from Steam News. How we read updates.
