Reccomend with Plant Versus Zombies Music.
Anyway, I like the idea, I like the idea of the story being Vampires going for you because they love the toxic blood you produced. I love how the vampires just look kind of dorky, it's charming in all honesty.
Critiques:
Black on dark Text is hard to read, If your background is dark, make text lighter to stand out.
Descriptions on items need to show their stats (5hp, 1 dmg for example) since right now I know the Bloodbags are 3x of the Shooter's health.
The Vampire, and the fat vampires were a bit difficult to distinguish.
Made it to Dracula but I was nowhere near strong enough to defeat him, but that's more a balance issue that more time could have given.
Honestly I liked it alot, and the fact I can compare this to PvZ shows your execution was good. You did a great job, keep it up!
You get one Cranberry cookie to help fend off the Vampires.