I really like the clean layout. In particular I like the way you use subheads to call out what players should take from each section.
The weapons are cool but as a filthy story gamer I kind of want a way for players to introduce them. Maybe if they roll doubles they can narrate the crowd throwing something in?
I love the clear in-game advancement. This feels like a one-shot and I really like one-shots that advance the characters during play. It's good structure for the game session and helps maintain interest.
I do wonder if the ring provides enough situation for an entire game, but I'd try it and find out.