Everyone calls it an animal crossing clone, but once you get into it you find out it's much more than that. Quite a lot more stuff to do compared to AC since it's not just decorating and selling stuff. Also the student/villager designs are pretty cool and more about the supernatural and weird rather than just animals.
Oh, depending on the version (american, european or japanese) the music is very different, one has public domain tracks and the other has original music, though i can't remember which ones in specific.