I think the real grave mistake would be not playing this game. Its has a very nice worrying atmosphere. I wouldn't say horror really, but there is definitely level of nervous you receive from walking the halls, unsure of exactly where your pursuer will be based off noise alone.
The lack of prior knowledge of whats going on in this mansion before entering also adds a nice amount of desire to explore and find secrets, Easter eggs, or read through the diaries laid out throughout.
There were a couple bugs here or there with throwing items or collision boxes, but nothing that makes it unplayable or impact the core game. Overall Great work!
P.S. Thanks for checking out the video before I had time to even review :