Wow, I am impressed.
From the first looks I think that this map has good chances of becoming a regular match map for some teams.
1. The flag is hard to camp.
2. The routes leading to other base are connected with other routes.
3. The map is quite tight so good fights are expected.
4. I, on the other hand, like that that barrel has 2 colors. Something new I think.
5. The flag is position the way I havent seen a flag position before, and I think that you have done a good job. You can grab the flag and get away from flag room without being cornered by angry team of campers.
Suggestions:
Maybe make the guns @ spawn more equal. Sometimes you get a trracer, sometimes carbine. Either make all spawns have 'low' guns, and place some spyders/carbines to either side (not to base, but closer to mid). And some carbines/cocker to mid. Maybe replace the mags you have up there with cocker/carbine and add 1 carbine/cocker to mid.
Make the 'floor' in mid with some other texture. Like grass and something. Remove some boxes, just keep the plants, clip brush a bit, and you have a decent looking mid.
You could also be more creative with the cavern lighting. Jits made some nice torches for chef, when he made his anubis. You could use those to light some areas. Also, they are cavern, they dont need to be so bright as they are at the moment. And as the caverns are tight, then you dont have to worry about someone camping in dark areas. Having different lights also helps the teams to recon more easily. Instead of saying 2nd route from the light, you could say, he is coming from torch cavern, or something like that.
That brick staircase to high looks very unfit. You could come up with something better, I am sure
.
Oh, and some spawns are facing the wall.