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. ;)
Use the same size for all worlds. Right now, there are these scroll bars and it is not really cool that you have to use them instead of seeing everything ;)
2016/12/4
This is the Only Level
2016/11/27
Adventure
2016/9/15
Missile Command
2016/8/10
Rubic's Cube Algorithm Visualiser
2016/8/10
Rubic's Cube Algorithm Visualiser
2016/8/9
Insect War
2016/8/9
Serangga Warcraft
2016/8/9
Serangga Warcraft
2016/7/25
Space Adventure