Big update idea I have, the ability to combine balls:
Imagine you pick sniper and bomb ball and now you have a bomb that always moves towards the closest box. Or you pick the money and scatter ball and now you have small pegs that also give you money.
And for some reason I think that if you had the ability to mix the simple ball with anything else the only thing you get would be slightly more damage and slightly cheaper upgrades, that may need some more thinking.
But other than that, what do you think?