1 "bug" if you want to call it that is that enemies will still see you even if you are in another room, (especially noticeable in the manor).

Now to be fair if they didn't move they might spawn camp you, but I doubt it's intended to be this way?

A visual bug is that the mirror doesn't mirror the character if they are in a different pose.
Another small bug is that towards the basement the left dark area you can walk "on top of it".

Another potential bug: at times you can't use arrow keys to move up or down an option, instead you have to over with your mouse first to make this happen.