Map looks like it might be fun, however I'm not sure you can make a map for a game using the games editor and release it under a different licence than the game is under...
Blender is GPL. You can release the models you make under any license. Same with the map editor. Plenty of maps are CC0, which is basically public domain and the best license you could give your mod, if you're willing to sacrifice credit. That's followed by CC-BY (give credit, but do whatever you want), then CC-BY-SA (give credit and license modifications under a compatible license), then CC-BY-NC-SA (same as CC-BY-SA, but must be non-commercial, though the definition of non-commercial is controversial, so this is not recommended for Glest mods).
At any rate, nice map.