The game I developed for Ludum Dare 22, December 16th-19th 2011, the theme was Alone.
You are an old wizard. One day you stumbled and accidentally killed everyone... But now they are returning as dumb zombies and are annoying you. Kill them all again, so you can be alone!
I used FlashDevelop, AS3, FlashPunk, Pro Motion and Photoshop Elements.
Check out the enhanced version here.