I was hoping an auto-snap to best fit might be an option at least in Zen mode. Also being able to slide pieces in and under, maybe with a button to unseat them if that location not desired, might be a good thing even in Classic mode.

Love this game, but please put an option to turn music off, listening to that minimal tune for hours on end is not a great prospect, and some satisfying sound effects would be welcome. "Even if it was your very favourite music you would probably appreciate being able to turn it off sometimes"....