An interesting addition might be the ability to wipe a line out if it's all of the same number.
edit: gah. this is really annoying me now because the controls to slide squares left or right only works about 50% of the time so I end up with lots of the same numbered squares adjacent to each other and no way of merging them. Which makes chaining a few squares together virtually impossible because at least 1 of every 3 left-right slides will fail:
But, i am also increasing the tendency of the block to freeze stronger as it moves down (i.e. with its every movement), so that sliding left or right doesnt become that easy.
There were few bugs with that, which i fixed. Does it still sound unreasonable.
That's probably not understandable....