It would be nice porting this game to the colourful Master System - Game Gear because the ZX Spectrum shares many similarities with the SMS, such us the processor frequency, the same resolution among others, these are the requirements for the game to work as the game's official page
http://spectralinterlude.com/ :
System Requirements
ZX Spectrum 128 compatible computer
Z80 CPU with 3,5MHz or faster
128Kb RAM or higher
Yamaha AY-3-8912 soundchip or compatible
Tape recorder
and the Master System specifications are:
CPU: Zilog Z80 at 3.579545 MHz (for NTSC), 3.54689493 MHz (for PAL/SECAM)
System RAM: 24 KB (8 kB of RAM and 16 kB of video RAM)
Resolution: 256x192
Sound: SN76489 PSG and YM2413 FM chip (japan only)
The RAM is higher than the SMS's but It could be managed as ROM memory, I recently contacted with Spectral Interlude's feedback asking for a SMS port but I was replied they have no sega programmers so they couldnt do it.
So this is my idea, making a team in order to port it so we can work with rewind team (Spectral Interlude's team), I think they would be willing to do so, but the inconvenient is that I'm not a programmer I only know the very basics (Z80 assembler, C++), but my idea is gather talented people to put their hands on it, that's my idea and if I could help in someway I'll do it then. So what do you think?, could you join this initiative?? Since the Master System deserves it that's because Konami never released a single game for this system.