!WARNING! DON'T PLAY BULLET HEAVEN IF YOU HAVEN'T PLAYED ANY BULLET HELL GAME (i.e. Danmaku [Legend II, you kind of want HARD mode], Frantic 1 or 2 [hard, intense, or frantic modes], et cetera) IT WILL BE REALLY DIFFICULT TO PASS LEVELS 6-20 WITHOUT SUCH EXPERIENCE. IT IS A BULLET HELL.
By the way, I personally really don't care for menu music, because it just gets annoying after a while... But this is fair.