Beat the game tonight, Costume Quest now holds the dubious distinction of being the very first game I've ever collected all of the trophies/achievements for. the end boss was kind of annoying, it wiped me out twice. All it seemed to take was the right combination of costumes and battlestamps rather than how well I worked the combat system, meaning getting every attack and defense bonus. That's really the only nitpick I have, overall it was an enjoyable experience and I'll likely be grabbing whatever dlc they put out for this game as well as Stacking.
Go, go Team Double Fine.