The concept is good but you need to game to give feedback to the player so they can see and understand how there actions are impacting the score. The game doesn't have to give the feed back at the time they make the beat and it doesn't even have to give it all away, even having just 1 or 2 of the things shown when saving the track, like highlighting something red that's negatively affected the score and highlighting something green that's positively effected the score. Just so the player can work out what they are punished for and what they are rewarded for.
however that's just my opinion and you can do with it what you will,
Congratulations on getting something completed and submitted that can be fully played through.