I was worried at first that it may be a mobile game, but I remembered the original flyer and the images on it, so I'm hoping it's going more in that way. Plus, I couldn't see him needing a kickstarter for a mobile game, nor people that are in the know (if this is what they are more than likely referring to) being excited about a mobile game.
As for the copywrite issue: I dunno. A lot of the enemies, including Dracula, are free domain. The idea itself can't be copy written, so there is nothing to stop him having a protagonist entering an antagonist's castle who just happens to have monsters inside it attacking people.
Copy write is a tricky subject, but I think IGA will be fine. It's kinds like Marvel and DC making the same type of characters, Coke and Pepsi making the same type of drinks, or a lot of these spiritual succesor games in general: as long as it isn't exactly the same and enough is changed, he can get away with it. More so since a lot of Castlevania's stuff is free domain.