I didn’t have time to put a tutorial into the game, so I’ll explain a few things here for those having trouble.

1) On the map, we have a number of islands with one or more bases on each. The size of the base plays a bit of a role in its economy.
2) At any base, you can buy and sell any of the four commodities. When an island has commodity icons on it, those resources are cheaper at all bases on the island. Buying commodities drives up their price at that base, while selling them drives it down. The effect is bigger at smaller bases – big bases have more inertia.
3) The prices of commodities fluctuate randomly around a certain midpoint. When a base blinks green, the prices there have been updated.
4) You can mouse over a base to compare its (sell) prices to those at your current location. Clicking a base makes it your destination.
5) Having selected a destination, you can choose a mode of transport to get you there. More expensive modes of transit are more reliable (fewer breakdowns), more secure (fewer pirates) and/or faster. Only aerial modes of transport can get you between islands.
6) Pirates become more common later in the game, so you don’t get too screwed early on. If hauling a load of minerals in the late game, though, you’ll want to take a tank or rocket.
7) When time runs out, you’re allowed to reach your destination (if in transit) and will automatically sell any commodities you’re carrying.
8) At the beginning of the game, you can only carry 4 units, but you can upgrade your carrying capacity. It gets more expensive the bigger you make it.
Better instructions will follow! Just rushing this out in time for the voting. Post any questions as comments and I’ll try to answer them.