Very nice texture placement, very nice atmospheric look of mars, just excellent. If you wanted to, you could definatly turn this into a SP map.

Very good start you got here!

Not built too narrow, some alternative paths seem already "set up" and I like some of the things I saw you'd done via cube geometry - always better than using mapmodels IMO, of which you've placed quite a number, but it's still within limits I guess :)

Please fix up your ZIP to travel between platforms: "Krypton.ogz" should be "krypton.ogz" :)
And your post is definitely not "Final Release" ... because there are no monsters around, at all.

This looks like it would be a fun map as a singleplayer. I notice it is listed as a singleplayer map but is it really a singleplayer map with no monsters, etc?