Good job!
I'm not normally a fan of this genre of games, however, having played your game i can say i really enjoyed it and i found it challenging around the mid 20's, which i am currently stuck on, however, being rewarded by a cool sounding beat kept spuring me on when the game got tough!
Great game, it kept me entertained for a good half hour or 2.
9/10 because eventually it can feel a tad bit repetative, maybe introduce different backgrounds/stage themes to eleviate that. other than that good job!