Well, I only did the intro of the game, the game itself was written by Chema, and in this version it’s probably 90% 6502 assembler.
That being said, I believe (would have to ask Chema) the original isometric engine was in C, so technically that would be possible to adapt to the ST relatively easily.
One of the biggest problems with the Oric, is that on that machine the minimal “graphic cell” is made of 6 pixels, not 8, that makes conversions to and from the machine to other plateforms quite complicated.