I still can not get 2.08 bas files to work. I think the SD card image needs to be 2.08H and not 2.06H, which are the ones available to download on zxspectrumnext.online...
I've just uploaded a new version of the game with an additional map and game mode.
There is also a specific CSpect version that uses a 2.08 SD card image containing the game, which can be run using the instructions described in the CSPECT section above.
This version also doesn't attempt to play any music, as the driver was causing problems for CSpect.
It's still available here:
https://dailly.blogspot.com/2023/07/cspect-v21944.html?m=1
This is the only version that will work with 2.08 of the Next OS at the moment.
Ah, it worked okay when I downloaded it a couple of weeks ago. It looks like it could be a temporary DropBox error, but if not then Mike Dailly might have removed it for some reason. I can't find any other sites with a download (and it's probably not a good idea to trust other sources anyway).
If you don't have a Spectrum Next to play the game on, then I'm happy for you to request a refund from itch.io support.