Have you played LHoD: Tomb of Zojir, too?
I really enjoyed that one; it preceded Serpent Moon.
Then there's a considerably older pair that equal one game, Dracula: Resurrection and Dracula 2: The Last Sanctuary.
I'm replaying them now...just started Sanctuary.
They're the best of the Dracula series, IMO, and there's no blood as far as I recall though the villains are really villainous (Dorko and her sisters are downright scary) and the graphics are still wonderful.
The dungeon in Sanctuary is gruesome but so beautifully done I've always loved just wandering around in there.
Did I mention some of the puzzles in this one will really give your brain a workout?
Well, they did mine.
Oh! I almost forgot to mention that they come in the GOG Dracula trilogy - and bless GOG's little bear heart - the problem with the stuttering voices in the beginning of Resurrection that practically ruined the disk version is GONE!!