This game makes me smile. I imagine that the pumpkins are attacking the castle, but the only thing they can do is hurl themselves up into the air, and here's this one guy shooting them down with arrows. So then the ghost pumpkins appear with their "Wooo" sound effect try to scare the defender, but he just shoots them down. Of course, the overly dramatic music just adds to it.
Gameplay is very fun and addictive, even if I experience some lag with larger numbers of pumpkins. Upgrades and more styles of pumpkins would be cool.
Good, clean fun. :)