I personally hate the rail gun (I'm usually its victim), but the map looks nice and clean, like an arena should.

I could imagine a few computer terminals or crates (only one or two) to make it feel more like a "place", if anything. Or flashing alert panels. You get the idea. 

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havent dled the map but I cant help but notice how much it looks like a simple UT map, the type of thing I would have made back in the day just messing around with Ued... Though it could be very fun, the railgun is uniquely satisfying and frustrating as a weapon.