PowerPC (ppc) is completely different computer type than Intel (aka x86, ia32, i386, x86_64, x64, amd64, em64t). Programs designed for one computer architecture can not be run on other computers
Some programs for Mac can work both on ppc and x86, but this is a trick. They are two actual programs for different computers, hidden in one file.
FeralHeart is written for x86, since there is no Windows for other computer types. Unfortunately you can't run it on ppc