Let me know if you want to collaborate to see if we can get this thing to work. I already talked to Manuel and he shared all the source code, so I can setup a repo on GitHub for us if you want. I have been fixing a few bugs but the main issue I have is that I cannot get it to compile correctly with the latest boriel zx-basic compiler. It has changed so much in the last 10 years and although I get it to compile and can launch it in an emulator, it seems to create memory issues where tiles, especially the timer countdown, start glitching, so there is definitely something off. I think before we reach out to boriel or open an issue directly to the zx-basic repo, we need to get it compiled correctly with the latest version of zx-basic.
Let me know what you think. :)