Sometimes the river still does look quite ugly, but much better than this diagonally river :D Actually it looks good! Maybe you could make the river not touching the river again, so it does not loop or create some other unrealistic figures like flowing back, but I am not really sure if that is possible/"easy" to implement. Maybe worth a try. And then, get the units working =)

He only used the wrong tag. You can not control anthing with your mouse. It Looks like the Greenfoot demo version. The difference is that we have not working and in reality not existing black keys

Hm, just tried to change my password to 'Greenfoot'. Looks like it was not a good idea to use a capital letter. Well, I pressed f. :D