The closest thing you can find to proper bullet hell on Steam.
Hard, no surprise, but it gets harder. Instead of playing as a single character with 4-some lifes, but instead, you play as a dozen dolls with a maz of a dozen lifes each, only if you have to gems.
Unlike Touhou, bombing is both the real challenge and the main gimmick of this game. To bomb, you need to survive until your FLOW bar maxes out, and then, RUN FACE FIRST INTO THE CLOSEST ENEMY YOU FIND, WHAHAHA!!! Seriously, when you run into an enemy, your doll explodes, doing massive damage and basically killing everything inside it's lengthy radius. It's the only way you can beat many of the bosses without Timing Out, Timing Out = Hard to dodge bullets and No respawning, you die there, game over.
Hold for the nigh-unfair difficulty, and dumbass doujin game devs not knowing what the hell the options are, or what a mouse is, it's the closest thing to bullet hell you can get, and is it hell.
Dark Souls can suck it.