I loved the graphics, and the music, felt very much like CastleVania, but man, it was unfair generally.
The fact that Dracula could spawn on top of you was what really made this bad, in fact, it's not so much that he could, it's just that you had no way of telling when. Besides that the ideal fighting mechanics would've worked out. (still very hard to hit the man without trading hits)
So there were two main bugs, if you held down attack, you'd infinitely hit with nothing, until you were damaged. The other one was you could get suspended in air until you jumped again, making you impervious to damage. Combining these two creates a soft lock.
So what can I say, you made a true NES replica, unfair buggy, but still kinda fun.