I kinda like it. It's responsive and reasonably well-made. I dont care about the Castlevania reference though, there are millions of other things that come to mind when playing it besides Castlevania. Klonoa for example.
The levels are too repetitive though, and it's nowhere near as good as Namcos masterpiece, but I'm a sucker for the 2.5D perspective platformer formula. This would've been excellent on the original playstation. It's arguably better than, say, Pandemonium.
Haunted Castle sucks, btw.