After my initial investigation I can verify that something is weird with the gameNetwork plugin.
Apps with it run fine on all devices up to and including iPhone 5.
From 5S and upwards (64-bit capable devices) the app crashes with this in the log:
2014-12-12 16:10:30.148 NinjaTwinz[860:238518] Runtime error
module ‘gameNetwork’ not found:resource (gameNetwork.lu) does not exist in archive
no field package.preload[‘gameNetwork’]
no file ‘/private/var/mobile/Containers/Bundle/Application/4B9238D0-1FC6-4F01-8667-B889779C790B/NinjaTwinz.app/gameNetwork.lua’
no file ‘/private/var/mobile/Containers/Bundle/Application/4B9238D0-1FC6-4F01-8667-B889779C790B/NinjaTwinz.app/gameNetwork.lua’
no file ‘./gameNetwork.so’
no file '/private/var/mobile/Containers/Bundle/Application/4B9238D0-1FC6-4F01-8667-B889779C790B/NinjaTwinz.app/gameNetwork.so’gameNetwork
The same thing happens on Xcode Simulator. All devices up to and including iPhone 5 run fine, but iPhone 5S, 6 and 6 Plus crash.
It only pertains to the gameNetwork plugin. I have an app that uses a bunch of plugins, and as soon as I comment out the gameNetwork plugin the app runs fine on all 64-bit capable devices. When I put the gameNetwork plugin back in, they crash. (tested with iPhone 6 simulator)
I’d recommend reporting a bug for this using the “Report a bug” link at the top of the page.
Once you have a case number you can post it here for future reference.