You need to disable menu access
I always get an error when I try to use it
Or maybe add a pause function
Also, a suggestion would be to hide the multiplyer window when you only have 1x and then add it when the variable reaches a certain number.
Another bug I noticed is one time I hit the key at the right momement, it played the animation but it didn't add 1 to my rock score or add 10 to my score, it was weird. I could have just been seeing things but I'm sure it did this.
Also, the song ends too soon, it ends right when the last note appears but it doesn't reach the end of the fret board so I can't play it.