Very cool visuals; I really like the limited palette and the bold strokes.
I like the unusual premise and setting, and the large cast of eccentric characters.
The crypto puzzle was a disproportionate piece of the gameplay, but I really enjoyed it (I used to do the Crypto Quote in the newspaper).
It would have been nice to have music along with the gameplay.
Also, it should be possible to re-interview a suspect after the first time.
Bug: In my first playthrough, I exited out of the cipher dialogue without solving it and afterwards I was unable to return. :( Clicking on the ghost would do nothing. Then I tried to start a new game, and it got stuck on Jeannie going "Boo!". I had to reload the page to restart the game.