Kero Blaster - Omake Boss Rush Hitless [Jacket Rush]

Cave Story with some frogs and cats yes.
At the end of the omake run (NG+), you can do a boss rush which contains most of the bosses in NG. You have to do this while you're still wearing your jacket meaning hitless the entire boss rush. Only hard bosses for me are the black blob and the last boss. I also don't have the Kuro Blaster but it wouldn't matter anyway if you have the strats™.
Steam Store : store.steampow...

[@ReticularTunic7]

Tip for Dark 2 ? Having a hard time to avoid the tendrils he spouts out. Its feels very unpredictable and impossible to avoid unless its rng base.

[@ethansantiago7013]

seems to be pretty rng-based, tho you can get an idea of where they'll go by where they are when it stops spinning

[@tomojpeg]

How does one access the boss rush? I can't find it anywhere.

[@Jonny_.]

Finish Zangyou Mode and ask for more at the end, then complete the stages in Omake. Boss Rush is at the end