Gorgeous pixel art and lovely understated sound. Some interesting scaling mechanics, and the enemy AI is frustrating in an "I'll get you next time!" kind of way.
Not sure how much depth of play is possible in the jam version, since I haven't been able to get past a handful of samples (I haven't played with the lures yet for instance) but I could see this becoming quite absorbing with further polish.
I'm also curious about influences. A bit of vampire survivor?