The art style is very cute, but the game suffers from its difficulty. The premise is also good, but some sort of tutorial would be heavily appreciated. Other stuff that would be nice is: a way to slow down the bat (its move speed that is) e.g holding spacebar to halve its speed; It's really hard to dodge that many bullets in a confined space, when you're moving at double their speed. Maybe also an increase to damage, it takes a *very* long time to kill the Vampire with the current damage setup.
It was enjoyable nonetheless, despite what I just said. Good job :D