We do not collect any information about you using the Cube Madness app. Since we don't personally collect any data, we don't share any with anyone else.
If you make backups of your device on a computer or to a cloud service, then information that the Cube Madness app stores on the device will generally be included in such backups. That information includes your in-game progress.
Questions or concerns can be sent to cubemadness@davidlong.org.