Super fun concept that could be taken alot further. One of the things you should consider in a bullet hell game is gradual wave increasing. Having the double saucers right at the start might just make the player give up. But after seeing you could destroy one and still dodge the other bullets was doable not much of a problem.
Consider droping more health, with the way you have it right now, its very difficult to feel accomplished or make it within the game that far