I've never actually played Paperboy but I can see why you would think of it. Not many isometric games with bikes I guess.
You are completely right about the control wheel. It's totally useless on the PC version and just obstructs the screen. I've not yet quite figured out how to determine what device the game is running on, otherwise I'd have hidden it when played on the PC. It's just there in case it's played on a phone.
Initially the shooting was actually happening on a 2D plane but the terrain had varying heights and the bullets kept hitting into it before they could get to the target. Also, because of the isometric view, it wouldn't have arrived where the player placed the crosshair, but slightly above because of the height difference.
Yes, I now realize the camera is super fast. Especially on mobile, it makes the game practically unplayable. Fortunately, this is easy to tweak.
Thank you for the feedback, it's very valuable to me.