It's a great idea but the UI needs work. Dragging the cargo bar to to the bottom doesn't set it to 0% for some reason. Same issue with the heading. Also, I think there should be a way to speed up launches.
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Oh, I see how this might be confusing playing on the computer but the heading and cargo are not actually sliders. You just swipe right/left or up/down anywhere on the screen to change their value. Its also purposefully kinda low on sensitivity so players can easily select precise values.
Thanks for playing :)