I raise this thread and myself from the grave just to reply to this. My apologies for not replying earlier, but I just read the five pages. It's not much to make anykind of "judgement" but anyway, here's my two cents:
Don't bash yourself over the art, Jenny. Shaky lines just show it's hand drawn like a painting, which is a welcomed change in this clean CG era. For the story, you're pretty much right. There is no spark in there, the story starts mid-way where a pig and a squid fights somewhere and everyone knows the hero's going to win... Despite the kamishibai feel, it feels like a boring action movie. No wonder you don't feel like finishing it.
My advice; scrap the story. Write a new one. Daydream about the squid and pig, the story will come there, in bits and pieces. Build the background as Plasman suggested; this was the driving force in UJ and the kamishibai is the perfect environment for it.
All in all... Don't worry, be happy!