Questions in TOO MANY NIGHTS

Share your creations!
how does one mod the game?
do i gotta remake the entire game?
or is there something in the files that i didnt find when i opened it?

Is anyone having trouble importing audio files into the sandbox's radio? Dragging an mp3 file onto it (and even clicking off it) freezes the game until I close it.
too many nighst was programed in scratch?
what is the best chararer in the game?