PLEASE LOCK THE SCREEN!!

I love this app, my 2yo LOVES this app. But he constantly closes it and messes around with everything else on my phone. PLEASE PLEASE PLEASE update to make it more difficult than just pressing the home button to exit the app. Its obvious that the children that play with this game are smart, hence, they know the ins and outs of these devices. I will immediately give this a five star rating just as soon as you update the lock option. Thanks.

Harry seeword about Preschool Adventure, v3.1