I finally got around to watching this and, WOW! I'm impressed. Probably my favorite part of your films is how you nail the eerie atmosphere, when most brickfilmers are not able to, or choose not to attempt to do so (I mean, we're using a toy, which is generally depicted in a bright, happy way).
Like others, I found it difficult to pinpoint a plot. However, this helped me focus more on figuring out what the purpose was in making this. In such a way, and through seeing certain similar shots repeated, and the choice of the title, I began to have a few themes come to mind. None was right there, in my face, but that just helped emphasize them even more. For example, "the way in is not always the easiest." Seeing the locked doors and frantic reactions repeatedly, emphasized this, showing the desperation that some go through in order to succeed. This is probably the most obvious theme, as I saw it, yet there were a number of more subtle ones.
Aside from that, my thoughts have been mostly covered by others: amazing sets, lighting, scale, decent sound, etc. Overall, I loved the film, and may have to watch it a couple more times, to try to get more out of it.
2nd place Darkness and Light entry:
The TreeBehind the Scenes