yeah i have found that too, i think it is because movement is actually gradual teleportation each frame. as the fireball gets faster it teleports further and further each frame. eventually it skips past the shield and because the ninja has a smaller shield it hits her first im going to continue to update ( i will next add upward attacks ) but im not sure it will be worth fixing this considering how hard it would probably be and i would rather spend the time adding more features

Thank you for updating, it now works in Greenfoot. However if I try to play online it just shows a grey screen and is not full screen. Also when in full screen the resolution and frame rate seem to be much lower. Any ideas of how to solve this?

I have added this to my game and all the new classes appear on the side, but when i run the game there is no fullscreen and it plays as normal. What is the problem?