Just like Turrican! With the advent of the Kung Fu Flash 2 putting REU DMA emulation plausible, might there be a way to create an NTSC version that preserves the PAL color depth, leveraging the DMA the way Sam's Journey does?
I could be wrong but I think Turrican didn’t scroll any colour in NTSC, it used one BG colour on all the chars.
I am already executing speed code on the ROM for a lot of the scrolling. There are more skilled coders out there who could get it working faster than me, but I am happy with this result.