At Sommarhack this weekend we somehow managed to win the zero bitplane competition with this contribution: https://youtu.be/QlbSEDq6Cno?si=sdocBAN_f3ZRj5fV
We just barely managed to get a higher score than SMFX with this demo, which in my opinion is more technically impressive: https://youtu.be/z2Ke-Irp7U8?si=fiBT7UXIl24bpIsa
The rules for the competition was that the demo should run on an Atari ST and should never display any graphics on the bitmap, and the only way you are allowed to display anything on the screen is by changing the background colour at precise times.