Sometimes its the simple looking maps that look the best, Good job with this map!

If i can suggest one thing it would be to change the colour of the floor to a slightly darker grey by like 10% or something just so that you can get better depth perception.

 

I agree with this on map simplicity. When I think of Halo, I think back to 2v2 split screen on the Halo CE maps and Halo2 maps that were very simple but were very fun to play on.