Great game but it freezes

I was really excited when I found this game again but now every time I play it if I hit any of the buttons on the lower panel itll freeze the game and I have to close it. I dont know if its because I switched from an iPhone 5 to a 6s or what but its a real bummer that I cant use all the app functions.

Kels1681 about Zed's Alchemy, v1.2