In addition to fixing some issues to make placement of the ad completely as google encourages developers to do, I've added eye movement. Actually there was eye movement very early on, but the effect of it disappeared as the game went from being slow to being much faster. I've added that the eyes will follow items when the snake is close to them.
For example, if you just drive around level far away from any snacks, the eyes will be looking mostly forward but also following where you think of turning. However, when the snake approaches an item, the eyes will be fixed on that item as long as you are close to it. When there are many items on the screen at once, the eyes will select the one that is closest, alternating between the different items and looking forward. There is an issue where the eyes spaz out a bit when you hold the phone just right, but it has absolutely no impact on gameplay.
