Owner of this app should be ashamed.
You have talent in creating games. Or at least they’re creator of this app did. But you have absolutely sold your soul. Putting an ad after every single set is despicable. No one can enjoy this game because of it. If you’re going to do some slimy crap like this at least offer a paid version. I thought the Apple App Store was better than to let this type of marketing on their App Store.