pretty cool game. One thing I don't like is that the game only have a single level, what is bad because after playing the game I knda wanted more lol. I also think that this singular level is a bit too hard for someone who never played 4k rhythm games (not my case but you know, not everyone is me)
I'm not going to lie though, the problem with this kind of game is that I definitively see charting as a hard and boring process, what's bad because for games like this, you not only want lots of charts (if you make a game like this then I assume you know what "chart" is), but also most rhythm game players like more gimmicky games with something special - like there are millions of other games like this so yours need to stand out. But ok, your decision, as I am trying to say that making this kind of game is risky