I only had the balance issue during the two first bosses. During normal gameplay there were so many corruption circles that the giant circle strategy was not viable, at least for me, so it forced me to be more careful about where I draw the circles. So it didn't ruin the experience at all for me :) I still really enjoyed it! Besides, it was not an easy strategy to find and it would be unrealistic to expect a jam game to be completely balanced, given our time restriction. It was a very small issue.
So happy to know our game is your favorite of the jam so far! Lots of respect for your team too. You built a highly engaging game :)