Clean, elegant and well polished game, but went for the same style for my game, so I may be biased :-p
I didn't manage to pass level 6, but I saved the game to my collection, so that I can finish it after the rating period ;-)
Very nice job!
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For Moonarchists I implemented a "cartoonish" physics for the sake of keeping the planets stable and easier to hit.
For each planet, I attract them to the black hole (and bullets are attracted to planets to make it easier to hit) https://github.com/renato-grottesi/moonarchists/blob/main/Game/Universe.gd#L85
Then I use Godot's impulse functions to interact with the physics engine: https://github.com/renato-grottesi/moonarchists/blob/main/Game/CelestialBody.gd#...