Title of this novel should be "Another unbalanced MMORPG: Dumb luck specialist".
MC is lucky dumbass. He played underpowered class for a month staying at level 1. Then he got ultra lucky mining drop that turned him into OP character (cause you know game balance is a ****). He had 0 contact with other players, knows 0 information about his class and is without his main class weapon (puppet) even though everyone had one. But somehow he is expert player???
Then character development... Except for playing the game he may be ficus for all we know. And considering style i doubt that he will develop later.
Worldbuilding... except badly designed game, we know absolutely nothing about RL. Also you get info dump about game here and there.
Overall badly written novel. There are much better quality written game novels out there.