My idea is that you are the god of light invading the dark castle.  The creatures there don’t much care for the light and many of them have no means of fighting back.  You need your light to see but it also roasts the creatures alive.  I want to make the player feel really bad about killing the creatures.  It took a while for my idea to solidify and I slacked off a lot at first.  So far I mostly concentrated on getting the pieces to make the game with.   Tomorrow I will focus on putting the pieces together and creating a level to play through.