jfelsman: Since it's still in development - name a concept that fits in line with the style of mini game that it is.
You might add planetary disasters or other events that drastically increase or decrease demand for a particular good. If you could see some indication of an event before it happened (a cluster of pirates roaming the system, a jump in solar activity, an icy comet that may impact a planet, visible early volcanic activity) you could effectively gamble on the effects. Will solar activity increase the price of electronics or reduce the price of fuel? (Okay, so maybe I could have thought of a better example.)
I'm not in for the competition, thanks. I just thought your game looked curious. I like the the exaggerated appearance of various planets.