Demo's been pretty decent so far, I really need more practice to even attempt to leave the sixth layer of hell. Having an improved training mode where it isn't just for combo practice but you're able to force enemies out of their passive state into a hostile to be able to get certain parries down. This would of course be unlocked bit by bit as you kill enemies, you gain access to them in training. Having perks and their descriptions in training would be very useful too, as trying to find out what some of them do feels like attempting to solve an unsolvable riddle.
Unfortunately I also have no clue what affects the soul count at the start of a run. Best of luck on making a good game overall.