Well, got my groove back I guess, beat Mom and then beat Mom's Heart pretty easily, forgot about the no damage part, if I would have tried harder I could have easily done that. And then I do a quick run as Judas, get some cool items, then get to a spikepit treasure room thing and figure "yeah I'll bite, even though I only have one heart", and then it killed me
Fury (is that what it's called?) is definitely one of my favorite new items, pretty much trivializes rooms with lots of enemies. I really like the thing that makes you sometimes spawn attack flies when shooting too.