I tried really hard to understand this game, I even went to your own website and played it there. I think the idea is you have 4 resources, food supplies peasants and soldiers. Each turn you can select a building to use, the farm gives 5 food for each peasant multiplied by its level, the house converts 5 soldiers to peasants for each level, the castle converts 5 peasants to soldiers for each level, and the mine gives 5 supplies for each peasant multiplied by its level. Upgrading a structure does not cost a turn, but does cost supplies. You can pick the building to interact with by clicking the center pedestal. If you do not have enough food to feed your people for the turn then you will lose, if you don't have enough soldiers to fight the enemies every 10th turn then you will lose, but every excess solider than the enemies counts for a new person.