Hiho, how can I actually erase my progress for real?
I got the Demo, liked the game, bought the full game, started it and stuff unlocked in the demo was already unlocked here, too. The coins gained in the Demo were also saved.
I tried the 'Wipe Data' function in the options, but it does not do anything at all (neither resetting progress, nor even deleting the current saved save stats.)
Furthermore I think I found a bug: When starting a new game, rushing to the first post box, getting a gallery coin and then existing the game, this coin does get saved. It feels unintended to have such an easy and cheesy way to farm gallery coins. (Well, you might call it a 'feature', too)