You can find the save data in the downloadable version following this general directory.
/Users/<User Name>/AppData/Local/<Game Name>
Exporting save data for the online version could be useful, but so much gets changed between updates that it might not always be possible.
Version .3 is the end goal for Act 1 being fully finished, so save data should be a lot more stable once I reach that stage.
At that point i'll be better able to set up exporting for the online version without worrying about the save data causing compatability issues further down the line.
Thank you for taking an interest in my game <3