Make sure to make the file name all lowercase. In the message (worldspawn) you can use lowercase and uppercase.
The map isn't lit and VIS. Run a final compile before releasing a map file.
If your map supports only one gamemode (e.g. CTF), you don't need to add the gamemode key to all other entities. Just set the gamemode in the worldspawn then and it works fine.
Add "angle" "#" to the player spawns, that the players don't look in front of a wall after spawning.
I'd add some equipment to the player spawns (ammo, co2, barrel, hopper, gun?). You can also add some equipment scattered on the map.
Nice to see that you already try to create stones and rocks. Try to avoid overlapping brushes here.
The map isn't symmetrical. Might be possible that it is what you want to have
I'd add some team indicators for a CTF map.
Some screenshots...
Red: There's a hole in the wall.
Red: This edge looks bad. It's only on the blue side.
I'll upload the map after you did a final compile (b2?).