You just watch the game play itself. Events Happen every now and then that changes the amount of food, workers, and brood you have, and you can view previous events by pressing the screen. You can press space to switch to a different background if you want a different color.
All code by me, images from the internet depicting a North American ant species, Lasius Neoniger, and the extra pixelated one is an ant larva. Mobile Compatible, but you cannot change the background.