RetroBalls is similar to old Commodore 64 or Amiga demos. It's a non-interactive sequence, playing music and showing some cool graphic FX. To create the demo, I used the tools coming with SexyKanji: Kanji Font Builder and Resource Generator. In addition, Gimp was used to manipulate the images. The music was in Protracker module format, converted to ogg with MOD4WIN and Audacity.
Source Code is included in the PC download. Shame on me, but the source isn't well documented - but the most of it is either very straight forward or just boring math ;) BTW, Mac Version is in universal binary format and runs on both, PPC and Intel based Macs.