The only way will be to redesign the concept. 29 backgrounds is too much.
I dont how big your capx file is... but i found out through testing that the xcode/ipad2 has memory issues with more then 20 MB sizes.
And the limit is a device limit . Try to use less background a mobile device has texture memory limits
It will also take forever if you load too many files. Think about it this are only images. Maybe you want also sound effect, background sound etc.
All this stuff will be preloaded and also uncompressed loaded into the memory.