Very fun! I love the art and the music doesn't get old whatsoever. Some of the phase 2 combos were practically impossible for me haha. Despite that I was still able to persevere and achieve victory!
My biggest suggestion would be to add a short countdown after pressing start. Since I was clicking start with my mouse and then having to move my hand to the arrow keys, I lost precious moments since the game starts expecting input immediately. Beyond that, the arrow indicators tended to blur together (especially when in a rush) and was hard to tell which key I actually needed to press.
Side note: I kept playing until level 7 to see if I'd become impervious to the vampires damage since my defense matched their attack... I did not. Great concept, well done!