The engine doesn’t support grouping things and THEN making them transparent as a whole. If I make the gauge (red-green in your picture) transparent then the backdrop (cyan) bleed through.
Yes
The variation (Spin Cycle) is also mirrored, there’s no need to further randomize the mirroring.
What is the “main” squadron? There’s no such distinction in the game.
That’s already in. But there’s always a chance you’ll get supernova with a regular environment. That’s ok.
Fixed in v.55 
Bug
So they can’t be farmed.
Nice idea, but very ugly to implement.
Early Bird has been reworked in v.55, which probably will correct this issue.
Don’t know. Perhaps some enemies are invisible, and hence unaffected by the bomb?
Not easy. Droid missions are not tied into any star system. In fact, droids can travel between star systems (but they currently don’t).
Known. Would require a significant rework.
Not enough space. And not very useful.
Rounding.
They need to look different than the orbiting asteroids. It helps the player know which is which.
Unnecessary.
Changed in v.55 Idea I can’t go much higher, though – I don’t want to balance medals against points. A medal should be its own reward.
Yes. There’s a per-wave key limit to prevent farming.
What do you mean by “stuck”?
That’s already possible. But only the ‘hard’ loop has enough enemies per group.