I really enjoy this. I don't think the bulletcount is over the top, I think it's fun actually, because you're forced to manage between "how many do I want to kill to make it more bearable" and "how many don't I want to kill because I want to see" , though wanting to see wins out in the end for me. I don't get hit as often as I expect when I see that many. Would've loved that boss fight though, time limits are harsh.
Also, the bgm is way too catchy. 10/10 arrange. Currently have the first two phantoms killed just so I can listen to it in peace.