Okay, so first- DIALOGUE! The original game did not have a lot so that’s a plus!
The strong suits here are more speed and sound choice! Corrupted BF as a bitcrushed cymbal is perfect!
There are only two things that I think will really make it better; 1, since most castle users are on mobile, the several jacks (a jack is two or more of the same notes in very rapid succession) in the notes exhaust the fingers and can cause multiple misses. Even the master player CommunityGame misses notes from too many jacks. I suggest making rapid notes different arrows or making them few and far between. Also, keep your jacks around 3, but not too many. If there are multiple jacks in one section, make them doubles and not triples.
The second is just a stupid thing compared to the last one, but if you can add an effect every time the arrows are hit at the right time, like the splash from the original game, it causes a physiological effect on the brain (Dopamine reward for “earning” the right timing)