Couple of observations...
The layout is great but it took me an hour to work out each gallery creates a page for me to use a link in my menu.
The L O A D I N G message looks "mickey mouse" - something smaller and a little more slick would give all that hard work you've put in a better look.
Once the gallery pic is open in the browser, there's no way to just click of the image around the dark-out area to close it once viewed, clicking back to get rid of the image then takes you out of the gallery which is initially confusing and subsequently annoying.
brilliant gallery though.
I have coded a gallery but the coding is very clunky, difficult to add images to and doesn't have the ease of use your gallery has I'd much rather use yours.