Great use of the assets! The art and music really gel together for a nice style. I would love to see where this project could end up given the time to flesh it out
Of course it's only a prototype so it's hard to say a lot about something so early in development, but a little more instruction on the submission page would have been pretty helpful (though I think I eventually figured it out). The biggest thing I think would really help flesh it out are indications of what state things are in, which is probably your planned next step anyway. I also think it might be nice if the only place it's possible to drag something is in the spot where it belongs rather than just any arbitrary spot
Make sure to post a followup if you take it any further!