To go along with the repetitive theme of the game with it have around 8 terrain patters, you managed to pick a song with very limited progress. Theres multiple moments in the song where you hear this repetitive tune then in comes the bass and youre thinking "ok, the music is building up... for... nothing..." and just goes back to its repetitive nature.
If you couldnt have more sample sizes, the least you wouldve done is a speed change or more projectile types.