I like the look of the fence up above the map, on top of the grassy cliff things. But, the clipping along the ridge prevents you from hitting it. Either move the fencing up to the edge so that i makes sense that you cant get on top of the map, or remove the ability to get on there completely. Right now there are a ton of ways to get up top, but you get blocked mid air. Doesn't make a lot of sense to me to use clipping when you could easily use obstacles to accomplish the same thing.
The spawns are in a straight line which could cause issues.
No need for a mid flag on a map that is 5 seconds from base to base.
There are two ways from low to high in the center. Each is fairly easy.
It's just going to be a spray fest in that center 512 unit square or so, there needs to be some sort of change to middle in my opinion.
The glass walls have some awkward proportions to them. Golden ratio please.
Follows the standard grass/rock look, not a bad thing, because they usually look good, but maybe add in something to make it stand out from the 50000 other grass maps lately.