Cool game! I got to round 11. The graphics looked really nice and the screen shake from getting hit felt perfect. I liked the idea of the shield harts that would give you extra protection but keep your power level up. Overall I felt this game was super well designed and I really enjoyed it. I had many of the same ideas with mine, down to the vampire inspired life stealing and getting more powerful the closer you are to death.
Overall great game, check out mine if you get a chance!