Leveling up

Hi i was just wondering if anyone can point me to a right direction or help me out.

I have this game with “balls” coming from down and going towards up and i was just wondering how can i make more and more of them come depending on the current level.

I guess all of them are going to be copies of the same “mc” but can anyone help me copying them…

thx a lot for any input:shifty::shifty: