Very cool concept and beautiful style. But I feel the balance is so off it's frustrating right after the tutorial. There's so little time before the deliveries expire that you're constantly stocking up, missing the single launch window before the delivery expires, and having to go back and change the stock and try for another planet.
It's such a tricky concept to get your head around, I think the game should be slowed right down. The speed it runs at when you press shift should be the default, with a button to speed it up if you're waiting for a rotation, and there should be a pause button that lets you scale the asteroids, just so you can pause and think through.