So I just now downloaded your game, stuck it in my Renpy folder, then went into Renpy and built a distribution for Mac on my Windows machine. I then transferred that version to my Mac and was able to get the game to work just fine. Granted, Mac does warn that it's an unknown developer but you can still open and run the game anyways, so just letting you know it is possible for you to make Mac distributions on a Windows machine - no sense in leaving out a whole group of potential players/supporters.
Anyways, looking forward to your next update, can't wait to see some mouse tiddies :)