I'll expand on what esteel is saying a little.
From the standpoint of players and server admins, this type of map isn't treated as a "real" map. It's more of an experimental map that you created to learn radiant. That's fine, and it's actaully good that you're experimenting with making maps like these. It's great that you're learning map editing for Nexuiz, but I would suggest to not release a map until you've put a decent amount of time into learning how to make your maps more playable. That would be the next step in your evolution as a mapper, working on map layout, movement pathways, item balancing (weapons, ammo), creating strings of items, basically applying some theory to your map layout.
I would also suggest to get some others to play around on your map and give you feedback, especially on these first handful of maps that you make. You can use IRC (chat) to get people to try our your map (
here are some instructions for using Nexuiz IRC). I would be happy to give you direct feedback on your maps while you are working on them. I could help give you some more ideas if you are having "mappers block".
There are lots of others in the Nexuiz community who would be willing to help you out in furthering your map making skills in this regard. I look forward to checking out your future maps.