Hey,
The problem here is that you need to add objects within your code, because as you may have spotted we can't add them interactively later! For more details on how to do that, see here: http://www.greenfoot.org/greenroom/images/1/12/Adding_objects.pdf. Also, your world at the moment is a bit talle than can fit on my screen (and therefore probably other's as well). Making it a bit shorter would probably make it more playable (though that's just a guess due to the lack of objects!) If you're having any problems feel free to use Greenfoot discuss or post back here.
2009/3/25