Add exit buttons, maybe. Love having to start over again just because I pressed the shop button for what's essentially a game to grab your cash. Don't bother with it.
I'd love for the keys to be re-bindable. I kinda prefer having an ASKL setup for four notes, sjdhbc. Still, this game is really lovely and I'd love to see it on Steam and Gamejolt tbh.
There is a reset button now that will delete everything on current map.