Really good! I love the concept of a vampire who is specifically allergic to B+ blood, but hey, gotta B Positive when in the belly of the snake!
The Scrollbars were kind of hard to look at, since they looked like condensed circles to a point, I think Squares would be a better fit in all honesty.
The platforms seemed to be really difficult, and borderline requiring bat form to reach them, sometimes twice in a row, meaning I had to take damage from the blood. Good thing the Blood throws you up for another try!
I kept forgeting the shop existed during my run in all honesty, but it seems to work well!