Yeah, not sure how you could be so clearly inspired by Touhou while simultaneously missing that your hitbox is merely a dot in those games
There's also two other problems with it: You can't change difficulty and you can't save during this minigame, the average Danganronpa fan that plays on mean may end up thinking they can handle the mean difficulty in this game only to be met with a very high difficulty spike compared to anything in the main games, so I think the ability to save and change difficulty should be obvious things to add, one for the players that are willing to take on the challenge but lack the time to do it and the other that don't want to spend hours on such a difficult part
Regardless if the devs really want to keep the minigame with its current difficulty, move it to an extra mode and nerf the one that's met in the main story, it's incredibly out of place during it, you could argue the rhythm minigame is equally out of place in the main games, but compare that to actual rhythm games and the difficulty difference is quite notable