There seem to be two different causes for this:
One is that some devices seem to struggle if there are Bluetooth audio devices (a speaker or headphones) attached. We’re looking into this, but for now the best thing to do is disconnect the audio device, restart the device and play the game through the phone/tablet’s speakers, or through wired headphones.
The other cause is using CyanogenMod or anoother custom Rom on the device.
Unfortunately we don’t offer official support for devices with custom Roms installed (they move too quickly and have too many problems for us to be able to fix), so this isn’t something we’re planning on investigating.
If you’re having this problem and feel that it’s ruining the game for you, please get in touch (info@fireproofgames.com) and we can refund your purchase.