Just a few things...
- the message is too long, you can see it ingame while loading the map
- use a beta extension, also if it's a remake
- avoid light entities, it looks very bad without a source
- use the angle key for your player spawns
- i don't like the secret way, however, there're weird looking rock and door textures and a double wall
- the barrels are too narrow
- the planks in the base between the glas windows and the wood ladder are misaligned
- there're some misalignments with the textures rock5_2 and gras1_8, reset the surface settings to align these textures
- move the right tile texture at the red flag a little bit, that the dark tile touches the dark tile of the other face
- most of these blue transparent walls missing a small blue brush at the side ramp
- the wood ladder in the base (after the arrows) is too short
- there's a small but very annoying edge on the top of the red mid high ramp (the one with the tiles)
- newer players can't grab the flag
This is enough for now. The rest looks good.
