Gods, Magic Pockets, Cadaver, Xenon 2, Speedball 2, Chaos Engine ... all bitmap bros games were created first on the ST so only 16 fixed colors used !! sounds incredible but that's true. Coleman & Malone did some very good job and master their palette perfectly.
In Gods, the palette vary slightly between levels, but still 16 colors only (except for the rainbow effect of course).
I don't know about the sound, though, but the visuals are identical on ST/Amiga/PC (except for Chaos Engine AA)