It makes me mad too, believe me!! It's really hard to figure out why this happens because it simply does not happen on my system. I try my best to figure out the cause and update the game after the voting phase.
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If it can help, the error message in the browser is" Uncaught RuntimeError: index out of bounds" ^^'.
Don't worry too much about it, fortunately other people can play the game, I'll just wait for your fix =) (please ping me if you manage to find a fix, the game seems really original and promising ^^)