Thank you, I'm very happy to hear that you have enjoyed it. I have been considering adding an ability to send a teammate to the sphinx puzzles to figure out the solution for you or at least give you a hint if you're stuck.
The receptionist at the desk isn't really a scene at all, it's just considered one by my code, future updates won't show the "!" on the map. In the coming update events will also remain for longer on the map but only play once if you have visited the location. This should cut down on both the repetition and annoyance of having the characters unavailable.
The idea of decipherable dialogue is neat, but I think I'd prefer to spend the time just adding more text variations instead. I already have it set up so that each scene can have several dialogue levels and adding more isn't too difficult. As more scenes and variations are added to the overall pool, repetition will go down.