This is an unofficial fan game, Konami is not involved with it. In the past, Konami has been really nice about fans not selling their works so hopefully that continues here.
I agree, the story and how it progressed was a key part of me enjoying Simon's Quest more than the other entries in the Castlevania line. I hope this one continues that with more to do and a bigger quest to complete.
RE: Castlevania Symphony of Horrors an Unreal Engine Powered Fan Remake