An extremely difficult bullet hell as the end of an incremental game. Seriously? It made me feel like I wasted my time playing this game.
I could say "too hard, make easier", but this is a problem more fundamental than that. Incremental games are generally calm and relaxing. Bullet hells are generally tense and nerve-wracking. The difference is very jarring and unpleasant. I strongly advise a scrap and redesign.
On a technical note: during the bullet hell, the framerate stops momentarily whenever the music changes. This is bad for the player in situations where fast and precise mouse movements are required. This is probably moot, however, as I'm advising that the bullet hell be completely scrapped, anyway.