One pretty cool thing is that the characters have imagination points that are renewed whenever they get 6 hours of sleep. The points can be spent on any number of in game effects and is largely left to the DM's discresion.
Overall, I liked this game but the makers worked way too hard to make the Grimm Lands a dark and twisted place (vampiric Little Red Riding Hood, indeed!)

Anyway, I was flipping through it and my girl was watching "Nightmare Before Chrismas" in the other room and you can probably guess where this is going.
Okay, so, The Hallow keeps the same new classes as Grimm but the characters are aged up into their teens. Anywhere from 13 to 18.
The storyline states that the players are going home from a Halloween party and/or dance when they are engulfed by a sudden mist (Man, I am such a genius. Where do I get this stuff?)
When the mist clears, the characters find themselves in a dark land with a tech/culture level of roughly 1800 AD.
The characters are still in their costumes. They still get imagination points but the points can only be spent in effects that are linked to the costumes:
Witches fly on broomstick.
Superhero gets a boost to strength.
Angels wings work.
Etc.
The Hallow is ruled over by Jack O'Lantern, the Pumpkin King. My thought is that he is the original Jack and the Hallow is where he ended up after wandering the world for so long.
The Hallow is also populated by all of the creatures of Halloween and horror in general with Dracula probably being a close second in power to Jack.
Anyway, that is the general idea behind the game I am making. Just thought I'd put it here and see what people thought.