A great game, but the buildup was a little short. I expected more rounds. With 2-3 more rounds with unique twists and 1-2 more items (for example an item that ejects the current shell and inserts it again (now at the end) would be cool) and it could feel more like a complete game.
Items addendum: My earlier suggestion would make the beer somewhat redundant (not really IMO but I see how people would think it too similar), but the point is to utilize shell memory (as in which shells remain in the shotgun) more in general. There could also be a round that puts further focus on this.