You have achieved something great
You have an audience that is very interested in this, please improve the engine and physics to make it less buggy.
You could also investigate how to make the songs loop because I feel you are using mp3 files instead of wav files so that the silent time between loops disappears.
Maybe you could make it so that the creator levels can have the camera on the back?
Although now that I think about it it would be very uncomfortable in certain levels, but it would be great to have a 3D level creator and not 2D