The label for the top score doesn't fit on screen, or there's a bug with getting the highest score. I only see a score of 3457 for Busch2207, but I've a higher one...

Ok, that's a good reason. And I could have known your knowledge of object oriented designing experience, since you're one of the creators of greenfoot :)

I've got a tip for you, davmac: you now set the image of a TextActor instance, but if you want to be a good object oriented programmer, the TextActor instances should know their images better than someone else. So it would be a better design if you would create a constructor int TextActor with an array of strings, and it creates its own image. This is just a tip, there's nothing wrong with the result right now: it would just be a better design.