Amazing, on full speed, it is exactly what I expected here on the site. Good, that the speed graph is not linear. Although I can only see the first five digits of the number. Some errors occurred, which only affected, as you said, the aesthetic. Good work :) By the way, the speed setting should not affect the amount of errors. It could lag, but for me, it does not lag at all. It is just very fast and even this half million does not take that long.

Wow, after a minute I thought that it would be impossible to shoot a goal against the hard opponent, but a bit later, I just won 10:4. :)

He does not and he already said that. If you have a problem with something related to this scenario, you can start a thread on the discussion board or write him a message here on Greenfoot. Maybe you will even send you the code via email.

With the too far range I meant that you die without actually touching the objects. A snowman for example kills you when you drive too near to his head. By the way, you can rename one of your scenarios by clicking on "edit scenario" top right of the game.