Nice game. Did you do the graphics and sounds yourself? One problem is that new sheep appear right in front of the tractor, and you have no chance to save them.

This is pretty good. But, you have multiple versions uploaded (because you've changed the name, by putting the version as part of the name) - do you really want that? Any votes on the old version won't carry forward to the new version. It's usually better to leave the name alone.

You might like to look at the tutorial videos: http://greenfoot.org/doc/videos.html Particularly the one titled "Initialising the world". It explains how to make objects appear when the scenario starts.