Map is pretty fun. Good job! That being said i think A and C have some major problems
Green = attackers route.
Yellow = Defender's sightlines/attacking routes
Red = my suggestion
Lets break down the layout. Blu's attacking routes, excluding the long walks that go through B, all leads up to 1 ramp (the highlighted box). When they get up to the ramp they don't have much cover or anywhere to defend themselves from, the health to the left only will delay their death. It's a deathtrap.
The middle yellow line is the longest sniper sightline in which you can't do much except hope the sniper misses. The line to the left can pick off people early on, and the one on the right finishes them off if they survive.
Here is my suggestion. The red box would be a building, so get rid of the rocks that are in the way. Also a walkway facing away from the point. I don't know what would be in the building, that's up to you
Point B is fine IMO, only minor changes needed that i don't know
Point C is kinda fun, don't like how theres only 1 ramp to the point, and 1 of the 2 routes pass the spawn. Blu demo's can easily stickyspawncamp when they're capping