I love this idea! It's very cute and there's some fun strategies. On my second run, I personally stayed by the coffin and once it was repaired, spammed bats. Sadly I kept getting a crash at the start of day 2 (looks like it failed to load the vampire hunter object).
I would appreciate more feedback on when I can spawn my helper dudes, but overall I feel like this has the core elements of a vampire survivors esc experience.