Kurz
Firstly, try not to panic. It's always possible that your game is working on other mobile devices, just not mine. I will also give it a go on the iPod touch when I get the chance.
Which version of Construct 2 are you using? Since I updated to beta v136 I also encountered a Touch Not Working problem on my own game. I assumed it was something to do with Gamejolt's chat system conflicting somehow, but its always possible there's a new bug that no ones aware of yet (though touch does work fine from my Dropbox account. Perhaps you could try uploading your game to Dropbox as well, and see if that makes a difference?)
On the plus side, what I saw of your game before the touch stopped working for me was very polished. The graphics and animation are looking very sharp, so well done there!
Anyway, I will keep on testing whenever I get the chance. I will also experiment with my own game, and share any useful findings