Hi!
I tried out the demo and thought it was very interesting. It had it's flaws as with all mods but overall it gave me a positive impression +1 rep for that
Although There's a few things you should consider. One of these are the fact that it's quite difficult to figure out where to go in the beginning due to lack of light(I acctually managed to crouchjump through the main gate) so add a bit of light to catch the eye of the player and try to guide him towards the fencengate.
Also I found several clipping textures around the map so you should take a look on that aswell.
Another factor that could be very performance demanding would be ones you get up into the castle some of the bricks in that room should be either static objects or removed.
Overall great map, maybe add some more details to the rooms and make it less linear and it will turn out epic!