I enjoyed the demo, loved the art and would buy the game. Just a couple of comments.
1. Ng is pronounced "Mm" rather than "Ung", as far as I know.
2. It would be nice if the puzzles were more organic to the setting. Like, for example, in the coded message, *why* would he write "Lud's Town" instead of "London"? That doesn't make any sense. You could have made the clue some location in London, e.g. a famous street or building, and then the player had to look it up to find out where it was.
The pelmanism mini game was a great idea and I like that you didn't explicitly tell the player what to do!