Generally pretty good, however, I did notice that the game seemed to just outright tell me that I missed a note even though I thought I was pretty bang on the money. Turns out that my sense of timing is just trash Eheheh however the game only having a Hit and Miss result is a bit brutal. Having an "Early" and "Late" result for each hit would be nice.
Oh, and I know that it's somewhat the point I feel, but it's tough to look at the cool animation when you need to focus on actually hitting notes, so maybe having short lulls in the song where the player can relax for a few moments and take their eyes off the chart would also be good.
Other than that, it's pretty good! The visuals are pretty and the music is good!~