I haven't been able to find a Mac compatible emulator that can run this game.
I submitted a bug to the OpenEmu/Nestopia Core dev they tested it and this is what they had to say:
"This ROM hits instruction SBX, which is an unofficial opcode. This brings us to three possible problems:
- The instruction does not necessarily behave reliably on real hardware and documentation may not be 100% accurate
- There is something wrong with banking in the emulator which causes the CPU to try to execute a part of the ROM that is not actually an instruction
- The ROM was built against a specific emulator and/or SD cartridge and has not been thoroughly tested
This does not work on Nestopia, FCEUX, or Mednafen from quick testing. Working on an Everdrive does not confirm it works on real hardware -- this confirms that it runs on the Everdrive's implementation of the MMC5 mapper chip only.
Should it be proven that this is an emulation bug, I am happy to fix it. Until then, I will assume the demo has not had sufficient testing to determine factually whether this is an emulation bug"
I really want to play this but I've hit a dead end