This game is very entertaining. I thought the physics felt right with the hangin' pup and the graphics were visually interesting. I like the method in which you came about your animations, too. The game itself was addicting and simple, a great combination that generally captivates more people than games that are overly-elaborate. My score, on the other hand, was terrible. :P
I would like to see a sequel, but a slight plot change. Perhaps you could flip the perspective. Give the player the choice of being the Ninja or Soldier, and the goal being to kill the pup 3 times within a certain amount of time, with multiple levels and perhaps even short movies or voice overs. It's just an idea, but hopefully you'll agree that it is a good one and will see at least some aspect of it realized. Thanks for the game and concept. Here's hopin' for some more of Paper Pug.