Since highscores are in fact working online, you can consider adding one which shows the score for each player. (Or at least the first place which is me now) :P

The game is working. Open this scenario: http://www.greenfoot.org/scenarios/12380 Do you get a red screen? You might want to look at this discussion http://www.greenfoot.org/topics/8200/ and follow the steps.

I can't handle lowercase letters. The images are missing I guess. What is so confusing about the traditional notation? The only things which can be confusing are xyzMES, but you didn't use them here yet. ;)