Candy should stop dropping once you've fully upgraded attack, speed, and special. It's hard to see incoming bullets with all the candy constantly flying at you.
Wait, all that just to deliver a wish list? The survivors must've been pissed. "Help you deliver your wish list? Over my dead body!" "Yes, that's the idea..." / "Ma'am, your son was very brave. Here are his remains, which we used to scale walls."