Thanks for the feedback! This is something I'll keep in mind for a second entry. Most people I think were able to study the orb movement pattern and find a good rhythm for defeating the bosses, but yes, the battles were difficult for some.
I eventually was able to figure out the patterns, but even with the pattern it was so punishing that if I made one mistake I would be screwed. I basically had to be perfect, which was kind of difficult using the controls of the 2DS I was playing it on. It might be easier with different types of controllers though. I think it would have been perfect if I just had a tiny bit more health or the orbs stayed around a fraction of a second longer.