bro got tilted over an nsfw game lmao
joking aside, I felt a lil frustrated over the jump in enemy power from 1st to 2nd floor in that first dungeon too and kinda rushed the dungeon because of worrying about the soul fragmentation my first time through. But getting like 1-2 good skills solves the combat struggles, and when you clear the dungeon you regain 20 soul fragments (which will go beyond 0 into the negatives). Its basically impossible to lose because of the soul fragments unless you are trying to (once you know what you're doing). There is even a cheap shop item that lets you recover soul fragments easily.
This game is really not as tough/punishing as it might initially seem, and maybe could have better in-game tips/balance (specifically in that first dungeon going from floor 1 to 2) to help make that more clear. But you being an ass about here isn't gonna help anyone. Be constructive or just don't post.