That game kicked ass!
Do you have a full version of it, or an update?
Unfortunately I don't. I do have some stages that no one has ever seen, however. One of them was a graveyard stage I designed, another was a complete remake of the Treasury from SCIV. There was also one that was basically one of the Mansion levels from CV2, but with an original layout.
Boss of the graveyard was Minotaur from Rondo. Treasury was supposed to be Galamoth with a Gold Bat mini-boss appearance, and the Mansion stage boss was Pazuzu from HoD with a redone sprite sheet. My favorite boss in SVK4 is Grakul, though. We made him really difficult in that game if I remember lol. He didn't fuck around.
Blah.. Now I'm sad that we never finished this game. It's only because our programmer left without telling anyone. I've been trying to teach myself Construct 2 lately to get the game back up and running, but don't tell anyone okay? After the TRIPE we've been fed by Konami, it's time for a real Castlevania experience, and I (along with some others who will remain unnamed right now) know how to deliver such an experience.