This Vampire Survivors-like has catgirls, is brilliant, and costs nothing

I don't know anything about VTubers, aside from the fact they're virtual… YouTubers...? What I do know, is there's a Vampire Survivors-like called HoloCure: Save The Fans that's entirely fan made, entirely free, and revolves around Hololive, a VTuber agency replete with catgirls. I am taken aback by how good it is.