To be honest, I don't think the map should be in beta just yet. I haven't played it in any proper tests, but just from running around by myself I can see that the map almost entirely consists of boring long corridors. The only exception is the mid room but even that is just a corridor, just with some more interesting stuff going on inside it.
Personally I don't find fighting in hallways all that exciting, explosive classes will be at an advantage a fair amount of the time as they can just bounce people around in the enclosed spaces without any issues. Would an outside section fit into your theme at all? A displacement cave or something that won't just be a flat wall would improve the map a fair bit I think. If not, try having some rooms in between corridors with some different heights within and some cover to hide behind just to vary the gameplay a little bit - apart from the corners in the corridors there is very little to hide behind currently.