Great game! It was very fun and it's visually impressive!
I love the concept! It's a mobile game I would very much enjoy playing on my phone during downtime. I like the fact that controls are so simple :D
The UI can be refined a bit, in my opinion. I was confused at first by the amount of information on screen, but the truth is that for the player, some of that information are not important most of the time. You could try applying some rules of visual hierarchy, making less important information less visibile. The first thing that comes to my mind is, for example, that "start heading" could be a flag you put directly on the heading wheel. Sames goes for "start cargo". "Life support" and "speed", should get more relevance only after the launch. And so on.
For me, the difficulty is well balanced. I managed to complete all the levels, although it took me a while to fully understand the mechanics. About the level desing I can't see any flaws, but I would have liked to have even simpler introductory levels, with fewer elements and more obvious trajectories for the ship.
Overall it's really a good game! ^-^/