Seems like a classic Sauerbraten duel map.
The map feels good to move around and to play. The layout seems like a safe choice.

Some playerstarts (like the 2 in the center of the map near the pile of sand) could have been placed better by putting them more towards the ground. This way, players have more time to dodge the opponent's shots while spawning. This normally isn't an issue, but due the map being so open, it can matter a lot.

Although I would rather see some more visuals, there are some details which are pretty fine for such a map.
Some more ruined details could have been added for example.
The texture of the boxes are a little odd (they don't appear to be boxes like now, but they function like it gameplay-wise)...
The top roof seems flat compared to the first floor.
A small logical question;
Why is there no sand in the pit with the teleport while there is loads of sand right outside the pit?
Despite alle this, the texturing works with the geometry.

The clipping works, but could be better.
The characteristics of the clipping-material isn't only to keep the player outside a certain area. It is also to let Cube Engine 2 know that a player can't be in that certain space which contains the clipping-material. Due this, you can save a lot of performance for rendering (and a map will be drawn smoother).
So try to put the clipping material everywhere outside the map where a player shouldn't belong.

In overall, nice map to play and move on, fun fun fun!

Solid map. Maybe do not use brick/wall textures on the ground. Looks strange.
Greetings
rabe