Thank you so much for playing this game, and taking the time to leave your thoughts on it!
The hubs are just made into large platforms that you can plonk the blimp down so you don't fall into the void if you mistime the landing (I was planning to add a grappling hook, but time). I am aware of the player audio bug, I just didn't get around to fixing it.
The landscape is definitely something that we were planning to go into more detail for (think game-jam quality programmer art rendition of Mirror's Edge but with a dense cloud layer covering anything but the top layers of the skyscrapers) [edit: it did look better in HDRP than URP]. And yeah, a speed gauge would help this problem, though I believe you'd have to calculate indicated air speed (IAS) at where you're pointing, which would involve calculating the drift - which was again due to a lack of time.
The player sliding problem was something that would probably had required a rewrite of the player character (or some sort of way of ensuring it remains in the same place in the blimp during motion), which is why it wasn't fixed. I do agree that its frustrating and I wish I had more time to fix it. With the ESC issue - I should've probably done more key bind testing on itch, as I haven't targeted itch before.
There is a visual wind representation (the little ribbons flying in the air), I will tweak the spawn rate if I have the time!