The only enemy I had a problem with was her Sister, the red-head girl who surrenders if she can't kill you in 5 rounds. (Needed 10~ "mercy-levels" to barely survive to the 5th round even after guarding every round + the familiars healing + buffing.) But aside from that, no problem with any types of enemies, maybe there was just something I missed that would've made the fight with her easier.
Also
tentacle3g after the second fight with the Sister you can choose to either beat her in a fight and kill her or beat her and then let her go. The 2 options for that are ".... and cleanse her" or ".... and leave her" Which I found to be a bit confusing and I had to gamble which one would let her go. Because cleansing could mean that you just kill the demon in her to save her and "leave her" can mean leave her to die. I would suggest to just make it "beat her and kill her" and "beat her and let her go".
Aside from that one confusing choice, the game is awesome, keep up the good work!