Damn that was very good, I felt like I was just making things up but at the same time I got a perfect (I think? tried again getting wrong on purpose after and I immediately get killed so I'm guessing I got all right).
I don't think it would make a great game if it was a full game of just that but it's actually a pretty interesting system.
What I would like to see on the other hand is a system like that used as a sort of divination skill in a game, where you get very cryptic messages about things like an upcoming quest and it would help you prepare for it if you interpret it correctly.