Alright, those very good questions. There are some subtle changing pixels in there. The bound height is currently set at -85. So super jumping is a no go. There is no background music. I assume nobody likes death metal in their stages and I don't want the DMCA agents after me.
I use 1.0 at 640X480. I'm not even sure of how many versions are out. I'm someday someone will explain that one to me.