well ... the idea is here. but that's just an idea for now.
the idea of a bullet hell comming from nothing is intresting but it could be cool if you had more paterns comming randomly and with arder and arder paterns coming more and more your score is high.
for me it's 2/5 because it has a lot to improve but you have the potential to do better than this.
(also try to use your own music or at least choose free-right music)
good luck with your next games