I'd really like for them to change the percentage of times a monster appears when you trick or treat. In the first game there was a monster when the door opened, for what felt like 80-90% percent of the time. I'd like it to be only about 20-25 % of the time a monster would appear, but then maybe make those monsters a little harder, that way your always a little scared of running in to a monster, but it's more exciting if it only happens once in a while and not constantly like in the first game.
I'd really like voice acting to be added to the game.
More stuff to explore around the world, more secret items and costumes and more games and events like bobbing for apples.
New areas like, a graveyard, a pumpkin patch, a haunted house, a creepy forrest, a big indoor halloween party.
New costumes like: werewolf, mummy, frankenstein's monster, witch, skelleton, grim reaper, ghost, octopus/kraken, zombie, jason type costume (friday the 13th) and bring back the pumpkin costume.