>So far, with these improvements, I have finished level 16. The screen is starting to get a little cluttered... BTW, it helps only in part to get a bigger screen, since the dots expand with the available screen size.

And it now takes me about 30 minutes to pass level 20... if I hit the right starting point and don't have to rotate a group of a dozen or more points to avoid getting stuck in the corner.

Still, quite addictive, even though there's nothing new as levels progress.