Expand the zip to a neutral location. So you know what you get and what's not new. You can test run it from here. (So save the zip for now.)
Remove all the designable.nib files. They take 31 MB on your HDD and do absolutely nothing save hint at something being wrong with the software author. How you do it is up to you, Bubba. Write to Jalkut and ask him. What's remarkable here (and puts Jalkut in a class of his own) is that Apple have taken the high ground today to automatically remove junk files like this on project builds. So you have to be extraordinarily untalented (and lame) to get past their checkpoints.
Compress the 28 TIFF files. They take 716 KB as is but need only 124 KB. Write to Jalkut and ask him to 're-save' the images again with Preview and using LZH compression.
Congratulations. You just cleaned 4.04 MB (~35%) of junk out of the application. Junk that was just junk and no more.