Yes, the game is kind of hard. I still have the original cartridge of this game, I've beaten it like 100 times.
You probably don't care, but the drawbridge theme music is the best in the entire game. My favorite weapon are the daggers, and I love spinning the chain whip around in circles. The hardest level in my opinion is the beginning of the water level.
Have you ever played Castlevania: Symphony of the Night for PSX?