Login Before Others: Stone Age

Different Summary and real story. What stone age? There iS never stone age in this novel. we already have a kingdom with king and his nobel structure like Baron from last chapter in 280 chapter. Even there is dwarven that already know how to use steel. So where is the stone age in the story?
The most i cant understand is MC. He know in less than 1 years there Will be alien invade earth,and earthling powerless to stop it. But what did he do? He only play game 8 hours, sleep until 9, go to shopping,building his power in game just like another Players without so sense of urgency.
In latest chapter, 290 chapter. It is half year before invasion. Yet his power still less powerful than a Baron. Even in this time his power magically beyond a kingdom, even better his area became all his power, but there is 100 area in the game. How did he plan to fight with aliens? How did he build star destroyer just like in the summary? ROFL