Great game - please add a couple improvements

This really is one of the best word games Ive come across. Not quite like any other, and very engaging. Challenging, too. Two suggested improvements:

1) when one puzzle is solved, let the next puzzle come right up, rather than having to select 3x3, 4x4, etc., each time; instead size could be set in options, and remain until player changes to another size level.
2) add an undo and/or start over option; sometimes after moving a lot of letters around, its nice to be able to go back to the previous move, or even to the beginning.

Still a great game, though!

abcrv about Word Squares