Already covered, already avoided. Non issue.
I see this a lot, and honestly the easiest response is: "I'm not using anything Konami created, including names, likenesses, assets, story, etc".
Here's what Konami owns from Castlevania 1 2 and 3:
-Code
-Graphics
-Music
-Levels
-ORIGINAL Characters (Belmonts, supporting characters sans Alucard, which is from a movie. The design is theirs however.)
-PARTS of their story- the ones they didn't lift from other works (almost everything).
Here's what Konami did not create:
-Literally everything else, as it was lifted from Hammer horror, Universal horror, and mythology.
Simon Quest's Transylvania Adventure is about the titular hero- "Simon Quest" (an obvious jab at CV2, which to spoil the joke is taking the piss at the fact that Konami stole a majority of their story), going on an adventure to resurrect Dracula to kick his ass (another jab). It's a piss take on NES games as a whole, and takes inspiration from a number of different things.
It does not however use any material owned by Konami, nor does it try to seem like it does. It's just doing exactly what they did in the 80s with Akumajou Dracula.
And that, as Forrest Gump states- is all I've got to say about that.