If you like "shock-style horror," as the cover art boasts, and are perfectly fine with playing older games, then you should love this one. It's old, and you'll be able to tell right away—for example, you need to use a mod fix to be able to change resolutions, and the AI and physics are rather rough around the edges. But other than that, the game has a number of really neat and interesting concepts behind it.
While the structure of the entire castle is static and pre-determined, the non-essential items, enemy encounters, and locations of NPCs are all randomized upon entering and re-entering every room (aside from the NPCs, which I believe are randomized upon starting a new game), making the jump scare element of this game crazy good. You're also pressed against the clock with about two and a half hours (from 10:30PM to 1:00AM in-game) in which you have to try and save all 17 family members that are scattered randomly throughout the castle (a few are bound to specific rooms for plot-related reasons), otherwise everyone who you fail to rescue will automatically perish. Each member you fail to rescue affects the strength of the final boss, so you'll want to find everyone and escort them to the entrance of the castle as quickly as you can.
The game has a number of other cool aspects to it, such as having to rely mostly on very restricted weapons (e.g. you have a crucifix but it only harms certain enemies or wards off others temporarily, flintlock guns that need to be reloaded every shot, losing the remainder of your loaded rounds if you reload prematurely, etc.), a fatigue system that drains very quickly, a whole bunch of different ways random enemy encounters can occur, brief texts throughout the castle with interesting tidbits on enemy and castle lore, atmospheric music, very low level lighting at some points, lots of areas to the castle, vampires that have to be killed the old-fashioned way (i.e. wooden stake in the heart), and of course, the timer—which does affect the deaths of certain family members!
Overall, I was fairly surprised by this game. The AI for the family member escorts is rather primitive, but that didn't stop me from enjoying it immensely. Better than any recent indie horror game and certainly one of the only games to use random generation in a meaningful and non-lazy way. I recommend trying to beat it with zero deaths for the ultimate experience.