I am so bad at this game!
I tried on the number row and was awful. I tried my number pad and was a bit better but still bad. Skipping numbers in the first song is a very cruel thing to do! Second song is a bit easier as it doesn't skip numbers.
Main issue I think is hit detection is a bit wonky and having 9 possible inputs with very little reaction time makes it very difficult.
Apart from that the art is fantastic and I love the music! I love that it's CC0 aswell. Great work!