Good game but issues

Its a good game but it seems to have a problem on the iPhone 6 Plus. I bought both levels and about a week later when I open the app, no characters appear and none of the buttons work. You cant even go back. Happened on my husbands phone too. He had to delete and re-download and start all over. And so am I :(

Pav2lop about SpongeBob Bubble Party