Zombies2

This is my second zombies game on Greenfoot (the first being http://www.greenfoot.org/scenarios/3927), and hopefully you enjoy the game :D
There are various changes I'm thinking of implementing, but this is a stable base to release on (though I only started this game this morning, and its now the afternoon, so don't expect wonders).
This is mainly an experiment in ambience
Oh and if anyone has music they'd like to suggest/supply for this, please email it to wheen.b@gmail.com