Progress in Ghost´n Globins now working at full speed on MSX2!!!

Great!

Given that it's using the GFX9000, presumably it doesn't even really need the MSX 2?

Wow

It's correct. The only differente when the image comes from the V9990 chip is the proccessor, but the R800 requires that game data and program were in main RAM, so 256KB (for now) are neccesary. If I can optimize the code for an standard Z80, I will modify the code to run from ROM, so only 16KB would be enough.

This would speed up the loads between stages as the data wouldn't be compressed.

Regarding audio, I was going to nag about the music being interrupted by the sound effects, but I just checked the original (arcade), and it behaves just the same.
For the melody, an SCC wave could be used that approaches the original more. Try to find a sharper harpsichord sound.
Oh, before I forget, it does already look and sound fantastic!