You're overpowered in the demo. Kill your pawns in the first quest and solo the Chimera without using herbs if you want to enjoy a stiffer challenge. You won't be obligated to use a full party in the actual game, but you'll also have more trouble because the things can be quite relentless. With every injury, your maximum HP goes down until you can rest (think of getting cursed repeatedly in Dark Souls), and many quests seem like they'll be tests of endurance that require you to travel carefully over long distances. Many areas are unsafe and will overwhelm you, and, at night, the game practically becomes survival horror. Hopefully the new game plus adds more difficulty if things do end up too easy.
Do we know how overpowered we are in the demo..? Because I basically didn't have to worry about being hit. I could just concentrate on attacking.