Both slider border and body colors must be manually set or not set. Setting only one may conflict with a user's custom skin choices.
According to this rule, you should be setting a slider border too.02:55:384 (1) - I think using this slider shape along felt to be too abnormal to interact with the surrounding patterns. Unlike 02:18:743 (1) - 02:19:659 (1) - where the shape was used at a short period of time which created a concept, the usage here felt too random.
04:00:139 - 04:01:687 - Why did you ignored these rhythms? Other vocal parts like 04:03:236 - 04:07:881 - etc were expressed as circles which made the rhythm concepts quite inconsistent.
Great work, call me back for a rebubble.