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There was a damage-ability that the final boss used on herself. Also, her self-heal skill didn't feel like it restored enough. While improving the latter might not have been the best idea (and probably should be subject to more playtesting), the former definitely called for a fix!
*Edit: Barring re-altering the final boss's self-heal, I'm feeling pretty confident about how this game turned out, and have zero qualms submitting it to the event-page.