The game was interesting, but I have a few critiques:
1) The first thing I checked was to see if it was multitouch, and I was disappointed. I should be able to tap kernels with as many fingers as I have (or 11, whichever is smaller).
2) It is not obvious when a round will end. One lasted 41 seconds. Another lasted 44. There are not instructions, and I can't tell after playing a few rounds.
3) I would recommend giving your contact info either in the app description or on your webpage. If I can't find contact info then I am likely to complain about bugs via an app review because that is the only method you gave me.
4) Please give some visual feedback for which kernel is about to pop. Some are different colors, but there is no apparent reason as they are all the same type.
5) You only see the opening menu the first time you play the game. There is no way to get back to the menu after a round only a exit button which exited the whole app. That is possibly a bug and it just crashed.
6) After one of the rounds I didn't get any menu and had to force quit the app to play again.
7) If you exit the game (ie. with the home button) it does not stop the clock, and then it shows a large time when you resume and finish the round.
8) The splash screen flashes up for a fraction of a second. The recommended method is to have a splash screen that looks mostly like the menu screen, but maybe without the buttons, so that the launch looks smoother.