Game Builder Garage is out for Switch. I’m sure there’ll be lots of Castlevania player created games for it. Here’s a test video for one I found on YouTube.
https://youtu.be/2NBH_A-BFe8If appropriate, this topic can be moved to a fan section or hardcore gaming, but I figured the possibility of tons of Castlevania fan created content coming out to an easily accessible platform might be worth noting here.