Pros:

Nice creative map design.
Very original.
Well made.

Cons:

I found the final part when waiting for rescue to be a little easy. But of course that will always depend on the player. (should be said that I am a somewhat new player though.)

Experienced a few bugs while playing. Nothing affecting the game play though.
When I reached the rescue boat I was suddenly lying on the ground and couldn't see anything. This was also the way the first map started (don't know if it is supposed to be that way in the beginning though).

Conclusion:

All in all a really nice, well made campaign. Of the few custom campaigns I've played, of which the other campaigns were highly rated ones from this same site, this one was definitely the better.
As I wrote in the Pros field; very original. I would very much recommend this to others looking for a good campaign to download.