This is such a cool idea and you implemented it very well in such a short period of time!
The idea of a projector that records/plays back the shadows of something over time is very novel, and it fits with the theme very well!
I think some light music/ambiance to further the intrigue could go a long way, but I feel you probably already know that and were under time constraints.
I'd like to see this idea expanded on further and released as a full game!