Well, first of all, it has to be a beta. So you should name it phlegmatic_b1/b2/etc....
Then, lit all your maps, even if they are betas. You should use qbsp vis rad, or a final compile.
For the gameplay, that map looks really small. Those water pillars look weird and pointless.
I don't really like maps that dont have co2's, but it's kind a small map, so it doesnt affect much. It's pretty hard to get to the flag, since it's under the water, and the hole to get to the flag is easily lineable, and whenever you grab (if you actually make your way to the flag), it's hard to cap or kill.
Then, I guess it's the first map you done, so don't release it. Just practise, show to friends, and when you think it's really a good map, you should release it.
I guess that's all