I was surprised how much i enoyed this. Thats a pretty interesting idea to have modifiers to your roulette slots, makes you want to spin even more. The premise with slop, Joes and Sloplan is great :d Visual presentation is also pretty good, very nice job.
I would make dragging of items into the slots a bit more responsive and obvious though, at first i didn't manage to do that. Also stacking items into one slot would be cool. And a countdown timer for feeding would be great as well.