(Haven't playtested this map with players yet, just looked around in Noclip.website and wanted to give my feedback from a game dev perspective)
Just loading in the visuals on this map strike me as indicative of early TF2 maps like Gorge and such, which is a great thing! You hit a really nice spot for balancing the colours out and making a colourful environment that still isn't overly saturated. I love it!
The detailing at this stage feels really nice but being far from cluttered. I do feel there could be more around the last points and there are a decent amount of ledges where I feel a trim of some sort may help to make the transition easier, but for the most part it looks nice!
The 3D skybox could maybe have a few more details in places to make it feel a little less empty. But I loved the little details like the bent boards on some of the wooden floors and the little spytech room with the window in spawn.
There's not much I can recommend apart from the previous things I wrote about here, and maybe you adding some more foliage to the grassy out of bounds areas. Bushes maybe? I could see you sticking a couple of the trees in the ground to where the leaves look like bushes. That could achieve a nice effect!
I love how this map looks and from a gameplay view the layout appears to be great fun, I hope to play it some day! This map makes me feel like how I pictured the world would look as an adult back when I was just a wee little kid
