Morphed, superb work. Everything works really well, and this is a great first map made originally for the race mode.
I have 2 cosmetic critiques, very minor- take them or leave them
1) The lighting from the sky is a bit boring- its sort of grey, and flattens things out (which kind of detracts from the awesome style you have going.
Your map is sort of set in a canyon, so I would expect more saturated, yellow, desert light, with more shadow definition.
Something more like Strahle's map:
2) The cloud effect is really neat, but isn't very convincing- I think it would work much better if the cloud layers were further apart (and moving at different speeds), and each layer had fewer clouds.
Overall, awesome! Keep up the great work!
