This map has a lot of potential, though I have some gripes with it:
1. A is very chokey and reminds me of Dustbowl's first point
I feel like it would be better balanced with a possible alternative route for attackers so classes like heavy or sniper who cannot perform special jumps won't need to fight with height disadvantage the whole time.
2. A caps slowly. (This is a personal gripe)
Going off of the Dustbowl example, since the first point is such a slogfest, the point caps very quickly to reward you for clearing the point out. This is not the case with A however. The point cap time is slow enough that I could die defending and get to the point after respawning before it was capped. I think maybe an increase in cap time by 20% would be enough.
3. Sniper vs. Soldier
A lot of your map seems to favor Soldiers/Demos or Snipers. B has gigantic height variation in the favor of the defenders, allowing easy soldier and demo bombs, while others favor Snipers by being extremely open with no barriers like fences or props. I think this issue will be fixed over time as you begin to add props and detailing.
4. Thunder Mountain B
B has a very clear resemblance to Thunder Mountain's last round where you play around a large spire/tower, but again the issue of high ground where Soldiers and Demomen can bomb too easily comes into play. I suggest small openings onto a higher part of the tower, and opening up the already existing tunnels a bit more, or just adding wide corridors like Thunder Mountain's other points.
This map has so much potential, but the three big issues are preventing this from unlocking it, in my opinion.
I look forward to seeing this map improve and get better in the future!
you dont need to implement all this this is just my opinion