I guess I'll go ahead and throw in my few words.
I personally love casters and I think the idea is a wonderful blend of planned and spontaneous casting. I personally think the numbers in the spells per day and spells you can prepare need to me moved around a little, but all in all the spells are really cool. But my main issue is the blood focus.
The mechanics for it are honestly kind of boring. You have a limited amount of uses per day of an ability that is either a one shot or that is genuinely interesting, but can only be used for a certain amount of rounds. Becoming exhausted for using all of your blood focus is kind of silly too. In the entry for it, "She cannot remove the fatigued condition until she has at least one use of this ability available." This makes it seem like it is possible to regain the uses back, but nowhere in the description does it say that there is such a way to get them back.
At the very least give the class a little more flavor. The bloodline arcana or even the chosen school abilities would be fantastic. This just feels like a stripped down caster to me with a few bonus feats. I played in my first game with an Arcanist and used the ability maybe once because it just seemed useless to use one of my 3 (well 2 without taking penalties for the rest of the game).
I guess either add something else to the blood focus or increases the uses. Maybe even add your INT bonus to the uses per day or make a way to regain uses since we can't go over the amount of uses that ability would have normally.