I'm surprised that this game is 2 years away. Isn't that plenty of time for someone else to create a clone? Sure, the graphics are primitive, but it doesn't matter for a game like this.
Anyway, if the guy is anything like me, he's probably hoping someone will waltz in and run the concept ahead of him, so he can play it without having to build it himself.
Really though, he's pretty save. It's too complex for the average indie to motor through, and it's too out there for a big studio to steal. Plus, aside from that, Chris Hecker is enough of a name that if someone tried to rip off the idea, he could probably litigate successfully.
Variations would also be awesome--- Spy versus Spy would also be a stellar spin and maybe even more fun. Imagine trying to figure out if that "guest" is also a human spy who has identified you and is about to stab you when you turn your back.
Ten people thought of the Spyparty idea three years ago. One of them spent two days doodling up rooms...
Great novelists spent their time rewriting their text. Mediocre novelists spend their time worrying about someone "stealing their idea".