Previously clouds were generated at the random height of the window, some time clouds were generated at the same level as the bar and they got hidden behind the bar. (https://snag.gy/m5KFXQ.jpg)
Fixed the cloud generation between background.top and bar.top, and limited movement of plane up to bar.top
TODO: Fix position of hint (https://snag.gy/Sv47MV.jpg) it is overriding bar buttons in vertical mode. The best options are top right and top left, needs to be discussed.