I've got 6 music tracks in Gunslugs now, and trying to get that version out (plus much smaller file size) But I seem to have broken my music player on real hardware.. oh dear :)
I am not sure I'd call Gunslugs a demake.. it's pretty much identical to the original really. To the extent that it's a shame, cos the game itself could look much better if designed around the Genesis (bigger sprites etc).
The reason I like doing these conversions though is because I have all the art already made, so without an artist I can get so much more of it done. Nice to have a fixed goal to aim for as well.. you know if something is right or wrong :)