If you are one of the users that has had their save file wiped since the last update, you can attempt to fix the issue by running the following command via Command Prompt. RUN AT OWN RISK.
A discussion thread on this subject can be found here:
http://steamcommunity.com/app/476460/discussions/0/133258092244708677/
The command is:
reg copy "HKEY_CURRENT_USER\SOFTWARE\jgallant\Picross Touch" "HKEY_CURRENT_USER\SOFTWARE\AppDataLow\Software\jgallant\Picross Touch" /f /s
The above command will copy the old key location to the new location. This change was done when I updated my version of Unity. I apologize for any inconvenience.
Please email me if you have any issues with this @ [email protected]