I remember seeing that bat in the discord server :]
This is such a unique and fun idea, i absolutely love the heartbeat sound leading to the window! I had a little bit of trouble with controls, they were a bit hard to get used to, but the speediness of the bat makes sense - it's a vampire, creature of the night!
The visuals - stunning. The backgrounds, the transition animation, the bat flying and collecting blood, it's all amasing! And i love the colors you chose, a lovely combination, especially for a game about vampires)
And the song - it's beautiful, and very fitting, adds up to the atmosphere a lot!
This is a lovely game!