Yeah, those first 30 seconds really are where the game is at it's best.
I think turret variety and turret price would be the near future tools to adress that: if not all turrets do the same, the position would matter a lot more, and the fewer turrets are on the inner ring the better.
Long term there was the idea that turrets interact when they are lined up. Like, place a power-boost-turret on the middle ring or something. But that was waaaaaay too much for the jam.
Yeah, the audio was a last minute addition, so i went with "if in doubt, make it too quiet instead of too loud".
I realized it did neither scroll nor shrink properly on too small resolutions, but couldn't adress it in time. Usually this is rather easy with Godot, but i tried something new. So that learning by doing kinda turned the GUI code into a mess.