Y'know, I'm very surprised to see that it's possible to save progress with your BoE mod in Hard Mode since it's supposed a mode that makes saving impossible (thus feeling like a hardcore/permadeath difficulty). I've tested it just now, and voilà, it worked!
I, and everyone else, always found Hard Mode to be quite distressing, unfair and nerve-wracking, but that BoE mod helps it a ton.