Thanks for the kind words! I appreciate it :) And I'm glad you're enjoying the game!
Hana will have a few more scenes, but she's a side girl so she won't have as much content as the main girls. It largely depends on player demand and personal inspiration.
To unlock Gwen and Jessica's Hallowe'en outfits you need to own the Manor and the Dungeon upgrade. Then make sure you've placed all the Hallowe'en decorations in your room (Coffin bed, jack o' lantern on the table and the witch poster) then go to the dungeon any evening :)