The Idea and execution are very awesome, had a lot of fun. And the alien guy scared me to death haha :D
The only thing is that I would like a kind of feedback if I was right or wrong. It took me a while to realize that I have to look at the floor number :D You could close the elevator and it goes up or down (to first floor) depending on if you where right or wrong. And then open again (like the level transition in Portal).
Very cool entry :)