Lurker

A game in which you play as a body snatching alien that is infecting a house party. Manage trust levels until you find your victim, but make sure not to get caught.

The core loop was implemented in a satisfactory way.

While I didn't personally feel all that creeped out, some members of our audience did so I think that answers our question pretty satisfactorily.

I would have liked to add a bit more juice to the game since it's pretty simple at the moment.

Adding more steps before getting your host, more complex interactions, and more levels would likely be the next steps.