Last fixes have been done at the party, so there was no time for a proper documentation of the code. One day I will do some cleanup, write something about how and why it works, and merge it with the main branch in github.
I know that the party entry is more a tech seminar than a demo, but visually it is a just another Boing! demo :-)

NTSC version is now available at https://github.com/nicodex/amiga-ocs-cpubltro/releases/tag/v0.4.1 (prod links do not need to be updated).