So, the biggest thing I got out of this map so far is that it is long. Very long. Walking from one first spawn to another is quite a task without teleporters. Also, I didn't notice a lot of metal for the first point for RED especially. Might want to consider upgrading some of the packs closer to the point. And the sightlines are a bit of an issue. The cave stretching from first point to second in particular has an obnoxiously long sightline that can be sniped for days.
Saying that, I quite liked the third and fourth points. The fourth in particular was quite nice, much better sightlines, better cover, much more difficult for BLU to push through, and the walk didn't feel quite as punishing for dying as BLU.
If this is your first payload map, it's quite good, just a tad long and needs a few sightlines cut off for snipers, in my not-experienced-at-all opinion.