Good first arena. There are a few things that could use some work. The terraforming needs some smoothing. I'd suggest using VoxelSniper (if you aren't already) in addition to some work with WorldPainter for a base. However, since it appears that you made this over a default map, I'd suggest just Voxel. Try and make a circular arena. Square ones don't give the same HGish feel as their rounded counterparts. While there are structures, try and add a few more here and there. Heavily terrain based maps tend to have less popularity among the players. Please do not think I'm trying to put you down. I just think you have more potential that could be used in later arenas that you are using in other builds.