Its a pity nothing came out of the Build Landscape.
I think its time to focus on on the custom textures and audio.
Make a snapshop with Check-in Changes now, if you haven’t already, give it a small description about the problem.
I’m assuming your textures are all conforming to the new power of 2
So I’m guessng the audio may be the issue
check out the bottom of this, post by Jimbohalo