Yup. Took alot of time (approx. 35-40 minutes) of saving and re-loading a save state to basically get critical attacks (because RNG in this game is very unforgiving).

Use bind up to heal, and try to save and reload a state if the Demon inflicts massive damage onto you (you may even evade its attacks). In the end, you'll get 300 extra coins, a stat point and some rewarding dialogue.