Hi, thanks a lot for trying out the game and giving your feedbacks! :)
Feedbacks noted, by the way, what do you mean by selling the ballness? Also yeah I can create different sized balls to maybe make it so you can only pass certain areas with a certain ball, that is a nice idea!
Also by stretching you mean giving some kind of bounce effect in the ball right?
Anyway thanks again for trying the game and giving your feedbacks! =)