Hey Mildcat!
Sorry to hear that. I tried looking for a "Save to disk" save button which is more reliable (since it looks like your saves have disappeared), but it seems that itch.io doesn't have that feature available.
In any way, I'm leaving you a link to mopoga were you can also play on your phone and save directly to your phone's memory (that way, you don't have to rely on your phone's cookies which can give you problems in that regard). We'll be sure to take a closer look to the game for next update to see if we can prevent this happening in the future.
Thanks for your input!