If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Your pumpkin patch is riddled with spooks. Who ya gonna call? No one. This is a Do-It-Yourself job!
Arrow keys - Move.
Protect your pumpkins from the ghosts by whacking them with your broomsticks (to whack them, simply approach them). Pick up candy and bat potions for bonus points.