Since you're no longer working on the game why not release the source files for the game and tell/share us what creating software you used to make PPD and let other people work/mod on it, im pretty sure that atleast some people are intrested and want to make the game better !!(i know i am) Now my knowledge and understanding of game creating or modding is pretty poor but that wont stop me from learning along with many others that wants to improve the game, like adding small improvements like small animations for loading screen, screenshot for songs in free play for songs selections to look like arcade/future tone insted of playing the movie in the background and making the arrow keys as XO/\square like FT for the PS4
Know that there are still people that plays PPD and this game NEEDs more improvements!!!