You're good, Van B! It was for PC Gamer UK. After much digging, I managed to find a single archived copy of the "blog" TGC ran during the 24 hour competition.
Unfortunately, all graphics, code snippets, and downloads are gone for good and I couldn't find a single other reference that has them. Somewhere deep in the abyss of DB history I'm sure someone still has these on their computer... Hmm.
Here is the link to the blog about it with hourly updates:
http://web.archive.org/web/20010123114700/http://www.darkbasic.com/gmd01.html
Not quite as exciting with no media. But at least I know what it was now.
Edit: I found a ZIP download of the game itself on an old Chinese file website (attaching here). I get "Error 38" whenever I try to run it on XP or Windows 7 so it may be missing files.
Edit 2: I'm an idiot! After all this, I dug out my original Darkbasic case and found the demo disc included. This contained all of the files I was after, safe and sound