Posting an imgur link to help illustrate my points a little bit better.
https://imgur.com/a/UaUUX7D
Image 1: Piggybacking off of DavyC, almost all the brazier's should be removed or the high up ones should be made so you can pass through them. Especially the ones on mid. It makes getting up there annoying as soldier.
Image 2: I like the idea you're going for but the hole definitely needs to be bigger. Jumping from the ledge to the hole/getting the hole in general is annoying and it really shouldn't be.
Image 3: Clip things like this off in the rest of the map as it makes traversing these walls annoying as you can get stuck in the pillars.
Image 4: Also like DavyC said definitely get rid of soldier being able to hid in these rafters in both mid and second, however keeping spots like this is fine imo as it gives soldiers good opportunities to potentially highbomb despite it probably not being a good spot anyway.
Image 5/6: There probably needs to be a better way to get on this ledge as having a pyro + this sentry spot thats super easy to get into seems unbeatable theory. You can just have the pyro sit on the ledge airblasting people off preventing any real way of countering this sentry spot besides just hard ubering into it.
Image 7: Just delete this. Its annoying and doesn't do anything.
Image 8: You can wedge yourself between the gate and the spawn. Not sure if you can do this on the opposite teams spawn doors to keep them open or not. Worth looking into.
Image 9: Same thing as mentioned earlier, probably shouldn't let soldiers sit up here in last.
Side note, I think the entire spawn should be moved forward. It feels kind of awkward to rollout on as well as the entire front of it not being the actual "spawn" so you can't b4nny bind.
Overall though for an alpha this map looks insane and I like a lot of the ideas that are going on here. Can't wait to see more from this map in the future.