Make of this advice what you will. Try uploading a zip version of the game as well. I can pretty much guarantee the number of people playing your game will double if you try to reach a bigger audience by ensuring that people who don't have win-rar and people on mac can download your game. It would be a lot of work but well worth the effort in my opinion.
Viewing post in Why is it always RAR?
I'll put it like this. Rar files, my Dell HP laptop can't run or extract the contents from without a paid program or first converting the file to zip. 'Zip files' are literally compressed folders. The same Dell HP laptop can easily extract files from a folder with the built-in File Explorer 'app'. I agree with travisz's point however, as more people would be able to access you game faster, easier, cheaper, and safer(I've run into too many false converter websites) if you give them multiple options.