The background scroll speed should be fixed in the 1.1 build. I'm not sure about the aspect ratio thing, but I tried my best with that.
Nice! Just played it. The background scroll speed is fixed.
The aspect ratio is a lot better now (I can still see the blue bar at times but a lot less now), but I am not able to see the timing bar at the top left at all (see image).
Maybe you can enforce a resolution? There's a way to do this in Unity (either through code or in the build settings)