A couple comments/suggestions for this mansion:
I was playing on normal mode.
• There's no music, so it could use some. I would suggest track 7 for the first section.
• Many of the rooms seem a bit too hard for normal.
16492 - Zapper beams seem a bit too fast.
16092 - The Arthurs seem a bit too fast, especially for players who have slower reaction speed. They appear, and immediately start running right at Jack, and the player has to think where to go. If he/she misses the platform back down the first time, Jack will get eaten.

15895 - The disappearing blocks seem too hard for normal, seeing they disappear and appear as you jump to the next.
16498 - Zapper beams are too fast for normal, it seems.
16892 - The disappearing platforms are really cutting it short, I always only get to the other side with a jump from the 3rd last block. If there where no fish to watch out for, it would be easier.
Other things:
• Room 16692 you can't open the green doors, not enough space on the ledge beside them, seeing you open them from the left.
• Room 16292 when you jump up to that secret, there is no way back. I was watching my secret count as I went up there to see when I got a secret. It went up twice - one on top of the bricks used to get to the secret, and one in the secret room. I think one of the
S
in the editor on the bricks in 16292 (top left-hand corner) was meant to be a
T
Trigger to turn the platforms on.
Well, other then that, it's a great, fun, simple mansion. Thats everything I found here. Jacob made this one, right? All the custom bricks, and all.
: