the song is very good
i like the melody, its unique and catchy.
i especially love when the piano hits the off key note, its well placed.
you said you didnt really know where to go with it.
i have a suggestion, but obviously you dont have to take it on board.
i think you should continue with the piano melody you have, for another bar.
then maybe the same melody but an octave higher, or a different key, to bring it to a crescendo, then to slow it down with a "one note per bar" thing for maybe two bars.
i think that may complete the song, if you feel it isnt done, but then again its your song and you can do with it what you will.
i still congratulate you on a great song.