I have to agree with JessT. I know I wouldnt download and install some compression app just to run someone's independent game. I would think more people are like that than not, but maybe I am wrong about others. Zip has been a mainstay forever, rar got slowly accepted, and while 7zip might be cool, its not mainstream. So when it comes to something like getting notariety for you hard work as a game coder, then it would best to use the compression mainstream standard (whether its the best or not) to have the best chances of people downloading and running your game.
or a 7z self extractor would work too
or post a zip a rar and a 7zip, and youll have all the bases covered
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