I too tried it in its earlier stages (since Harmony of Despair didn't seem like it would come PSN side), and the hitbox issues hindered the experience greatly. I do agree though that the programming is difficult to do, and to replicate castlevania's system to a tee might be difficult to do (not to mention real life time constraints, etc). The videos last I had checked didn't replicate exactly how the game played yet, but I am curious how it runs now...
Kamui Zero, did you give it a try yet?