Pros:

+ Interesting Concept
+ Humorous
+ Tank Trap

Cons:

- When the Jockey spawns in its cage, he's glowing blue.
- The Spitter also glows either green or blue, but spawns horizontally on the ground.
- Far, far, far too short. This concept could be expanded into a full campaign given the premise.

Conclusion:

I like the idea of having a Left 4 Dead 2 Tutorial map that winds up being some kind of trap, and the humorous lines here and there are certainly a nice touch. There are a couple bugs with the special infected spawning in their cages, and the bot survivors tend to stay in the area in which they spawned. The biggest downfall, though, is the duration of the map. It's beatable in under 5m if the player knows what they're doing. I think given this concept, the map could be made to be much more than what it is.