Yes, it is an iOS game. I will add this information to post 1.
I had crashing issues in the beginning as well. After trying a few things, I realised that it has to do with how you enter the information. For entering the amount of cups, lemons and sugar you wish to buy, you must just enter the number. For the amount you wish to sell the lemonade for, you must express your answer in terms of dollars but with no dollar sign. For example, if you wanted to sell your lemonade for one dollar and fifty cents, you would enter "1.50".
I am up to level 29 and have $22.36.