Hi,
I had a bug while playing. I got stuck in the ceiling while jumping before passing the room.
On the other hand, as a Castlevania fan, I can say that the sensations are perfect (I love the Boss). I would, however, add a little difficulty, such as increasing the speed of the zombies, which are too slow for my taste.
Good luck with further development ;)
PS : I'm french music composer and I've made a musical sketche with some inspiration of Castlevania music. I would love to work on your project. Feel free to contact me here : https://leomonsang.com/#contact