The most interesting thing about this game to me was my bewilderment. As I played the demo, I kept thinking to myself, "is this all there is to it?". But I kept on playing and playing all the while thinking that. What kept me going? I dunno, but something did, so you must be onto something.
Finally, I just had to force myself to quit.
One thing that would really enhance this game is historical market information. Charts and graphs are always good. Even if players don't use it to plan investment strategies, it is fun to see how the history of your game has gone. I added this feature to Space HoRSE and got good feedback from it.
Also, when leaving a planet and seeing the "map" of planets, it would be nice to have a little spaceship icon or something to indicate your current planet.