You are not an evil witch, just a misunderstood one. The various villagers have decided that you are evil and must therefore be burned at the stake. Since you ARE a witch this is your weakness and don't have a choice but to fight back. Use your first spell to turn the various villagers into frogs. After that continue to click on them until the toads burst. If you do not pop the toads fast enough your spell will wear off and the villagers will turn back to normal and resume their march on your house. After each level take the souls you have earned to get more spells to handle the stronger and larger quantity of villagers coming to burn you.