Loved it!
I liked some old text-based adventures, but something that really pleased me was the fact that the game tells you if it can understand your command before you say it. It also takes a guess at what you're going to say. I don't understand what that's for though since you can't press a button and enter the suggestion. Perhaps for a spelling check?
A good idea might be some secret commands (assuming that you didn't put any) that do weird things. You know, easter eggs.