Even worse: it's possible to do as much shifting around as you like.
I got bored after about 45 minutes. My score was somewhere over 4,000,000. Later, when I went to continue the game, it was gone.
I have to believe that the author meant to enforce some rules. Right now, there are basically none.
Better Games to Play that are similar (both from Sang Moon Joo):
Zig Zag Number