When I beat Nine Circles, it felt super hard, especially that ship part. Wave part was only really difficult in the first half, though. Overall, I think this level deserves to be Medium Demon (imo). Right alongside Jawbreaker and Fairydust, I played those levels to understand how to navigate semi-memory waves at high speed, and they really helped. From a gameplay perspective, it's not the best choice as your first hardest, but it's definitely not garbage either. For 1.9 level, decorations is really good, fresh, and interesting. This level created a whole new style of decoration that's still relevant today! Zobros definitely made an interesting effect-styled level.