CHEATS

When you get to the stage where you have no cash left and there is no spice
to be collected, send your harvester to the enemy camp. It will be
destroyed, another one will replace it and you'll receive seven credits.
You can repeat this as many times as you like.

To harvest spice in no time at all click on a harvester who is harvesting
spice and keep clicking on him. The percentage of spice harvested goes up
for each click on the harvestor. This save both time and money.