This is "Just a cool Beta", Boomslang says, which took him about 20 minutes. The screenshot says it all, really - two concentric circles and that small central cross-passageway. I couldn't find any strangenesses or subtleties, just a tiny map for a small number of people to get really hectic.
You may not want to play it for as long as Boom took to make it, but it ought to be fun on the right occasion! A revised and expanded version is now available, Captions 2-1.