But I tried to give you money to access more than the demo lessons and couldn't. Hit the 3-month sub on my kid's ipad, sent request to parent ipad (mine) to authorize, authorized it, and... nothing. No payment occurred, no access granted, and now even after a re-install that middle option and "restore" both seem to be non-functional. Can still select the other two, but I don't want those and anyway I'm not sure they'll do anything.
[EDIT] I just went to try it again but I created an account a couple days ago in the process of trying to fix it (though it already had one, I think, but I have no idea how it got set up; I guess my kid must have just clicked through some things, so I replaced that nonsense with a real account) and it seems to have reset progress, so, to be allowed to try to pay, now I have to go through some lessons first, unless there's some secret way to get to the payment screen.
Minor issue report uncovered in the process of the attempt: the app uses both portrait and landscape orientations depending on the view, but seems to hardcode which direction is "up" for both rather than letting them flip with the physical device orientation, which is annoying if, say, your device is connected to a charger and needs to sit a certain way. It doesn't even seem to use the current up/down orientation on initial render and then stick to that, which would at least be better than just having up and down hardcoded to specific sides of the screen.
[EDIT 2] Made it through the free part of Human Body, confirmed, 3-month option is still not responding to touches at all.