Literally stripped one of my games to barebones, audio, fonts, events and the thing just won't play level 1. Really not impressed with trying to export to iOS, android, nice and simple, everything works as it should. iOS however oh my!
All crashes seem to be down to font and/or audio, yet without using any fonts or audio, the crashes still occur.
Use latest c3, export to high ios version, use smallest spritesheet setting, use latest xcode. See if that makes any difference.
Otherwise try turning off 'Canvas rendering' in Safari options and see if that makes any difference, just for verification.