I feel like it should have a sort of gimmick, you know? Like, a unique and fun gameplay feature which pulls people back in, not just a layout and art style. I'm thinking something to do with a sarcophagus -- and I'm going to go back to it -- a shiny *golden* sarcophagus. Maybe an extra-large one players can fight in and capture with an ancient heavy's face beveled on the top. Or something.
If you trust me, try killing the symmetry a bit by adding new areas to the upper-left and lower-right corners of it (based on the overview shot). It would create some spontaneous frontlines rather than having players leave their exits always looking left.