Did some research and apparently you can find it here if you're using a mac version "Game.app/Contents/Resources/app.nw/save" though you're playing in browser as you mentioned so maybe you've cleared some cache/history in your browser having it deleted somehow. It's just my guess though!
but the weirdest part is when i play it, it still have the save i tested few hours ago, which i already deleted it. ( i mean the game, i didn't deleted the save directly)
update; i deleted the save directly, and it worked, the save is now gone, seems there is something wrong with my broswer, but how?
but i'm still curious about how u guys play the mac version without using broswer or third party software like the crossover i'm using, my nwjs just keep crashing, though i download the latest version of nwjs, and throw the index.html into the nwjs windows, it said it failed to load: Data/Actor.json.
so is there any solution?
it just a little bit weird that even your masterpiece already has a mac version but i still have to play it on window simulate system(crossover).