Please stop trying to explain your game is better than it is. If the being able to screw up your pattern by touching the same node twice in a row within a split second (because you don't have absurd precision with your chosen pointing device) is meant to be a feature, it's a rubbish feature, a result of poor design. (I can see that being able to hit the same note twice is handy for composition, but there's little sense ruining the game's actual playability for that.) On a less egregious note, with the third level, I kept forgetting the target pattern - a key to show the target pattern again would be nice.
Issues aside, it's an interesting premise - not particularly on theme though, since the way you are advised to play the game, and the way of scoring points, is nothing to do with discovering things. The music generation element is actually good fun; watching the 'beat' reverberate around the node graph you create is interesting. I think you may have been better off removing the scoring and predetermined orders entirely, and making it a more open game about composition instead, though that's just my opinion of course.
Note: I don't comment to gather critique on my commenting ability. Please do not attack my opinions, or I'll adjust my rating of your game accordingly. Sorry I'm having to be so blunt.