This is good. I enjoyed the somewhat constrain physics and I think the difficulty and level design was appropriate. The bottomless pit in the first level took me like two tries, but after getting past that, I made it all the way to Remilia until I died again. On my 2nd run that got past stage 1, I got a 1CC.
Very fair difficulty that manages to rewards patience without feeling like you're forced to play passively. You did a great job capturing the classic Castlevania feel while sprinkling in some more bullets for show. Also, the music is excellent and the pixel art looks authentic.