Not bad, some things to work on:
1. Layout: The layout needs to have another route. Somehow somewhere, there needs to be one way in and another out. If there is only one way then it is way too easy for bravo to defend. Also, make red have a bit more of a base, maybe a small building.
2. Scenery: I like the fog around the 'bunker,' however there just isn't enough cover on the hills. Add vegetation, grass 'n stuff. Inside the bunker you also need boxes and stuff, cause its pretty boring now.
3. Da Floor: The floor of the whole thing needs to be thicker. Just do it and shade it, it looks nicer.
Other than that its pretty interesting.