Great art, aesthetic, and gameplay!
For critiques, a checkpoint would be nice, especially on slightly longer levels. The end of the first level has a slight bug where if you keep the 2nd vampire sword monster, the barrier opens up and you can complete the level. Also, Necromancer is kind of easy to cheese in the beginning. You run up to him and keep meleeing while shooting blood bullets while able. I think if you play him “fair” he’s too challenging. May be worth a bit of balancing.
Overall, a fun and polished game!