This make me think that the real Marisa is kind of weak if the Mini-Hakkero works that way...
Here is what the Touhou wiki says on the use of the Mini-Hakkero.
* Marisa's lesson of how to "Spark" o Concentrate your mind o Mutter the spell to Mini-Hakkero tenderly o Aim at someone you don't like o Now unleash your annihilation of love!
-ZUN
Not that that maters or is even the point of the comic, but still.
I'm not sure if he's keeping up with the comments (which he seems intent on quadrupling) as he's been asked to stop a few times now. I've sent him a personal message asking him to tone it down...