In android go to settings -> game data -> export data. then save it somewhere you'll be able to find it later. transfer the savefile o your pc by using an usb-cable. on pc use the import data in the settings.
have not tried it yet but should work :)
Thanks for your comment and I am glad you had fun with my game. I will definitely think about your suggestion.
If you find any unintentional bugs or you miss a feature write a comment!
the minimap works by just drawing the position of the blocks on the screen (with draw gui) at 1/4 of their original size