Battle, by 
hmmmm, that looks as if you have spent really a lot of time into this project. ;)
But seriously… It isn’t that special. The eyecandy isn’t bad, but it could have been also much more interesting. The cave looks way too linear in my opinion.
The idea of pushing the other into the lava isn’t too good either. Espacially because you can avoid falling down very easy on this arena.. Maybe you could place some traps (e.g. springs that push you into the lava, collapsing or disappearing scenary,etc). And I think it would be better to make more small platforms, so you need to jump from one platform onto the other. Then this gametype would be more challenging and it would offer some more tactical possibilities.
So for now it really isn’t that great as it sounds in the description.
DR? – Not yet, improve your gametype.