I want to use a Buildbox template and update, add some more levels and functions to the game and Publish the game. Should I do it?
Sure The idea of a Template is to give you a Good Starting point in creating your game. Give it a name, new levels, etc... Also I would change The look of it (Graphics) to suit your own ideas. Maybe add some new features? The sky's the limit in creating your own game Good Luck !