There are plenty of ways you could go with this... Without changing the base mechanics you could make it so blocks packed tightly together are harder to steal. Or you could make it so when you fill the blanket it gets cleared and you get a reward or score higher. You could also make it so orientation of your food gives you a score bonus, stuff like that. Or you could do all of those, idk. If you were to do those, you'd probably want to make it so you can't stack food on top of one another... That's just off the top of my head tho, so I'm sure you guys will think of something better given time!