The Undo event now gives no graphic effect, only the border of the button changes color.
I think the game would look nicer if the Undo would have some animation, too.
If merging the path backwards is not easy to do, then maybe it would be good to make a simple fade-out-fade-in on the cells affected in the undo event.
Also, pressing the Undo button during this animation should be handled the same way as pressing it during the normal cell merge animation.
The Undo event now gives no graphic effect, only the border of the button changes color. I think the game would look nicer if the Undo would have some animation, too. If merging the path backwards is not easy to do, then maybe it would be good to make a simple fade-out-fade-in on the cells affected in the undo event.
Also, pressing the Undo button during this animation should be handled the same way as pressing it during the normal cell merge animation.