Kids love it, but they dont have to purchase it multiple times

It is clever to put the ads at the bottom of a game for toddlers - because they are bound to hit it repeatedly and parents may be inclined to go ahead and purchase just to stop the ads. But - why doesnt that carry over to multiple devices? I have twin two year olds. I have the app on my iPad - but yesterday both boys wanted to play it. So I downloaded it to my phone, only to find ads again. Its so disappointing to read the reviews and see so many people back to 2012 loving the app, but having the same complaint. I had started searching for more by the same company but it doesnt make sense to have to purchase the app for each separate device we have - so I wont purchase more until that is corrected. Very disappointing.

NHTravelgirl about Friendly Shapes Storybook