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Real glad you're enjoying it so far, Bruno. Can't wait to hear how it played for you.

As for similarity to Land of Og, this is just one of those cases of convergent evolution. I actually only heard about Land of Og for the first time when someone mentioned the similarity during the Kickstarter, and I went out and grabbed a copy on DTRPG afterwards. 

Believe it or not, Before Fire actually started off as a much more serious game based on the Savage Worlds system, with the idea being that you would slowly build a civilization from the Stone Age through the Iron Age. In working on the Stone Age portion, the game just seemed so absurd at that stage that I felt it was better to just lean into the comedy. It slowly evolved from there with the limited vocabulary mechanic actually being one of the last I tried (it originally started as a gimmick for an initiative system based on Blindman's Bluff with lots of grunting involved).

All that said, credit where it's due, Land of Og was definitely the first to land on this idea. If someone is looking for a crunchier game of Stone Age comedy than this, that'd be my first recommendation.