My code wishlist:
I would really love to see items to collect within each room. For example, in the Conservatory, you could collect shovels, in the Dungeon weapons, in the lab...lab stuff, and then use them to battle the creature. They could either reduce the number of hits necessary to defeat the monster or increase the jackpots depending on the number of items collected. The rooms are too cool to be nothing other than an image on the screen, there should be something to do in them. I think dungeon is the only room with a special scoring feature in it.
I'd also love slow rising frank come back...
I'd like to be called something other than "a regular ghostbuster" all the time.