hilarious! i killed the princess at the end, but i had a reason. It reelates to Princess Peach in Mario Bros getting captured by Bowser... If the princess was taken out of the equation, then everything is fine :D
EDIT: I JUST WENT BACK AND PLAYED THROUGH IT ALL AGAIN SO THAT I COULD SEE WHAT HAPPENS WHEN YOU KILL THE DRAGON INSTEAD, NOTHING HAPPENS!!! YOU CAN'T KILL THE DRAGON!!! WHY??? YOU SHOULD BE ABLE TO!!!
not mad, but it kinda makes no sense to me :/