The graphics and sound are a nice retro gameboy-like backdrop for gameplay mechanics based on Castlevania. It really looks like a great retro game. But I felt like the gameplay itself was pretty trivial -- just walk through the level with at most a couple of enemies at a time that were pretty straightforward to kill, without any significant challenge. A mis-timed whip lashing wouldn't really leave you vulnerable to getting hit by enemies. The bossfight I initially kind of liked because I thought that I would need to whip him directly, which would make it pretty hard since I couldn't see a way to predict whether he was going to throw the orb high enough to duck under or not. But after realizing that you could ricochet it back at him, the bossfight also turned quite easy.
Overall, while it's aesthetically appealing, my opinion (take it for what it's worth) is that the enemies and level design could stand to be more difficult.