One of my life dreams is to rewrite a Castlevania game. To go back from scratch, with Simon Belmont traversing the massive time and space bending castle of Dracula, set in a fictional world based on the mythology of Transylvania. I have such vivid scenes of it in my mind. One such is a large prep room in which periodically massive ogre like creatures, the cooks, come and go and you must navigate around giant ovens and pillars without being caught. Another is a long bridge connecting two towers high above the rest of the castle. The full moon stands above and, keeping in tradition of the original Castlevania games, here is where you would confront the Werewolf. And of course the classic ballroom scene, not to mention the unfathomably large library. It is a dream I will cling onto in hopes I can be responsible for it before I die. It would be an awesome game by my vision. The best since Super Castlevania.
Isolation would be a key factor. After a certain point in the game, closer to the beginning, there would be no further contact with any humans (save for few you may come across in the castle, though one could imagine the conditions). All sources of interaction (which would still be sparing) would be with enchanted inhabitants of the castle, most of which would not be interested in conversation or at least friendship. Isolation amongst overly expanded space and time would be a big factor in creating the mood of the game. I would want to create the feeling in the player that they were traversing an unlimited space, alone, and only by miracle and intuition did they proceed or make achievements.
For the world, I imagine a Vampire Hunter D-esque world minus the lasers, where every 100 years Dracula's castle appears in some place in the mountains. Then, for one year, Dracula feasts and spreads his influence on the world. Afterwards, the castle seems to vanish, and where once the castle seemed to stand, only another mountain range.
A family of professional monster hunters, and whose lineage can be traced to Dracula's earliest years as objectors to his human rule (as of course he'd be an accursed human, the romantic and mythological Impaler turned demon by revenge and sorrow). It just so happens that Castlevania will appear in his lifetime, and so at an early age decides his fate is to enter the most off limits region imaginable. He goes alone, as no sane man would go with him. Nothing but his trust in himself and chain whip for good measure.
Also, the Grim Reaper and the Frankenstein monster (and the massive accompanying lab) are musts.
A high reaching dream, but dream no less.