Thank you very much for your feedback! I'm happy that you enjoyed the music and the vastness of space.
Yes, better instructions/tutorials are on the top of my todo list. I'm taking notes of what people found confusing, so hopefully I can clear things up in the next update.
Good point about the 3D looking lifeless at the moment. I did experiment with a toon shader, but I didn't get it to look good so I dropped that before I lost too much time. That's another thing that I'd like to look into again after the rating phase. I've also spotted some neat postprocessing effects on the asset store that I'd love to try out, to give it a more painterly style.