Very nice game. However, after a certain level (no idea which one, maybe add a level counter?) I got the usual black screen between levels, but this time it wouldn't go away, whatever I did (in Vice). I don't think I have completed all 200 levels. :)
That sounds like as if the next level could not be loaded for whatever reason. I had actually tested for the uploaded d64 file that I could load all levels up until the final congratulations screen after the last level. But may be it is something else I can not think of. Is the error reproducible? after which level does it happen? (level symbol?)
The level symbol is actually a binary level counter.