That's not technically danmaku, I don't think. In the touhou games they're pretty much non-lethal light shows... fanon is hardly consistent, anyway. There's been images here that show a dosu spark doing the same amount of damage as a match or a dosu getting defeated by a rock being thrown at it...
Danmaku basically means curtain fire (of bullets). It can be anything, from harmless lightshows to Ikaruga style stuff. I don't feel my take on it should be the basis.