Hey Doug, I conducted the poll on the "Commodore Amiga" FB page, not on my games page.. ;)
The problem with NTSC is not implementing the correct mode, but that the game runs faster and has less time per frame to blit objects.
As it is, the game is running a typical A500 (and also A1000, where I usually test on) to its maximum capacity, meaning, it's also already sometimes over it, which results in dropping frames. You could play the game in NTSC, but it would feel super slow, unless you have some kind of accelerator built in that is making up the blittertime lost by the additional frames per second.
Changing all of this would unfortunately need an extensive rebuild of the games levels. Which is something I'd rather like to avoid...
Hope you might enjoy the game anyway, many greets, Michael