I like your art.
I agree that this is not much of a game, but I see some potential here. Maybe you could add some alleys or something so that your creature can get to other streets? Eating different things evolves your creature in different ways?
But the big thing: If you are going to make a game where something eats things and gets bigger, take it all the way. That creature should have been eating houses before I was done. That was the pay-off I was looking for!
If you want to update this, I would happily re-visit it.