I like the concept. The gameplay is simple but interesting. I would have wished to have other food items with different effect. Maybe one that reduces the radius again.
It feels like sometimes the you won screen appears randomly and when you start the game with try again, your starting position is too close to a human and you loose one life without being able to do anything about it.
Maybe something to visualize how much is left to do until you win would be nice. Like a counter or a bar that fills up as you go.
Overall well done and keep going :)