Took me a little over half an hour, but I played it all the way through. First of all, lemme say that this is probably the best high-tech map I've seen in a long time, and really the sort of thing I aspire to. There's variety between the canyon area and the base, design is innovative and texturing/trimwork is excellent. I really can't find a fault with how this map looks, but how it plays is a slightly different story.
*SPOILER*
Overall, the gameplay is nice, though ammo does have serious constraints. I didn't have to cheat to get through (this was on Let's Rock, mind you) though there were several fights I had to deliberately skip because I simply didn't have the ammo. The big underwater infected zone was one of them, though I couldn't find any reason to go down there in the first place. I nearly had to run from the battle lord in the warehouse area as well, though I managed to find an RPG stashed in one of those metal crates. The pickup sprite for it, however, clips with the sprites of the crate (even after you've busted it open) so the first time I went through, I didn't think there was anything inside. There were a few other instances where I'd get a random explosion in the face, which was a tad more aggravating than anything else, but overall I had fun. Look forward to seeing what else you can cook up.
