You can still one shot a lot of trash. The game is much harder though. Mobs hit harder, effects trigger faster, your effects trigger slower, and the scale and density of what you fight is asymmetrical to your character power.
Those walking spider tanks with a bazooka that points in every direction, the electricity werewolves, the desert tornadoes and the double poison bombers... these mobs you can encounter all at once and their density alone will wreck you in seconds. Despite the fact they are relatively soft targets.
Bosses have white hits that exceed player animation frames.
This is exactly how a difficult action game is made by Team Ninja, From Soft, or Platinum. All the same design elements are here.
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I would like a high contrast option. Too much stuff blends into the background.
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Don't even bother allocating skills as Blood Mage until you have the gear to support it. You will just kill yourself and there is no upside to Sanguinmancy until you have more skill points and gear for the sub class.