How to restart in TD?

Hi guys!I am trying to develop a Tower defense game for touch devices.

How to make a restart button in TD?

Thanks!:)

something like this?

on button clicked -> restart layout

                                   set score to 0

Or make a sprite that your can click and restart the layout. The button is as far as i remember not compatible with all exporter.

Is there some plugins for that? :)

Thanks!:)