So yeah I finished the game...
But to be honnest there is nothing really impressive. Someone could probably finish the game without using a walktrough now that there are people that tells you how to kneel near the lack with a crystal equipped etc...
But I can't put myself in the skin of someone who doesn't already knowns all this stuff after finishing the game multiple times so I don't know if it's actually "possible" to finish the game without other clues than the ones present in the game.
I guess there is still nothing that tells you how to use the "oak stake" properly, nor does anyone says where exactly (2 places) to use garlic to summon the strange man, and you have to find the clues in book without knowing their location which can only be done by equipping dracula's eye, which means you're shield-less (and you don't get the eye before the 3rd mansion so you have already done most of the game at this point).