I was very intrigued by this game, and wondered if it would work on my Omni 128HQ Spectrum clone with divMMC built in.
Unfortunately, it doesn’t out of the box.
The Omni supports 128k machine code games, and the sound chip, but runs in “User 0” mode, leaving you with 48k BASIC only, so the game breaks when it utilizes the 128 RAM disk.
That said, I have been able to convert the game to leverage the SD storage of the divMMC and it works great.
As a bonus, when I enable the accelerator on the Omni, which doubles the clock speed, the pointer movement works much more fluidly.
I am play-testing it now, for the first time, and really getting into it, and will be sending you a donation.
In the meantime, if you want me to send you a copy of the esxDOS converted version, I would be only to glad to do so. Just let me know.