Memory leak; lags on iPad 2 and iPhone 4s.

This game lags on the iPhone 4s and iPad 2. The lags are so bad that the game will crash in less than 5 minutes. It doesnt save your progress either. I usually cant get past the first room on either device.
----update------
Ok now that I upgraded to an iPhone 6 plus it plays great. Its actually pretty good game. I still cant find a way to save progress and Im not lucky enough to find the store on level 3. I want the store to pop up right next to me when the 3rd level spawns. It would make the game awesome. Im adding a star and will give 5 stars when I see a way to save the game and buy things from the store easier.

MAthTch about Card Dungeon