You must grow the vampire population by turning all humans into vampires. Be careful not to attack vampire hunters or other vampires. Drinking blood fills your bloodmeter which you can use to activate Vampire Vision to differentiate between humans, hunters and other vampires.
This is my entry for the Ludum Dare 34 compo. It was written in libgdx in less than 48 hours.
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Mouse to select
Q for Vampire Vision
W for attacking