Ha, I can't even begin to imagine how a factory-vania would work but if someone can pull it off, I'm down. MV and factory games are 2 of my current favorite genres.
It is stiiiiiillll in development. I am trying to be patient because I want it to be finished when it's released but dang lol. We got a few good ones in the meantime. Haiku and Lonely Fungus are 2 indie MV darlings that everyone should play. Haiku is very much inspired by HK, but Lonely Fungus is like Hollow Knight and Celeste combined.