I'm not a bullet hell expert, so I can't judge well how well it is in terms of Bullet Hell games. As for my personal noob experience, it did feel too fast and chaotic, with color a bit too similar. Balancing is hard, so I feel you ;_; I love the colors by itself but in a context of a skill-based game like Bullet hell, it can cause lots of confusion (especially for noobs like me xD)
UI-wise, I feel like a chunk of the left screen is blank (maybe to evoke that DoDonPachi feels)? Maybe it was intentional, but it would be cool if that space can be used for something too. Like say the gameplay screen being bigger (like Touhou?)
I really like Chimata's MGS intercom(?) screen, and the beeps too! Also like how you use the Pride theme visual-wise instead of most entries going with more Story wise!