Just tested it. The lighting needs a bit more work, had to spawn some lights here and there for bare minimum of visibility.
You know how to doors are opened automatically? People can get confused so you should add a sign or somewhat.
Took me a while to understand how the teleporters worked.
Needs a skybox.
Needs more props.
All in all it's a 8/10. Good map, just a few tweaks and it'll be better. Great job for your first map, keep it up.