Ok, if its a remake, I would gather there's a certain amount of familiarity to be upheld, but honestly, it doesn't stand on its own as a Source powered map.
I direct your attention to this screenshot:
http://img165.imageshack.us/img165/9182/pic4vw9.jpg - now, in this example, you've got a yellow plaster texture that's clashing horribly with the concrete textures which is also clashing with the red. If you were going for a creative look, I would've created an entirely new texture set for the map (maybe even adopt a cartoon style, which'd be very easy to create).
As for props, I refer to both sorts. There's a distinct lack of detail in the map, which can only be supplied by props. Given the setting of the map (which seems to be some sort of industrial setting), a lot of the HL2 props would work quite well. As for physics props, I understand what you mean, but I would've put a bit more trash around, just for looks: heck, you can disable the physics for them to save on lag.
As for lighting, you may consider it to be the best, but I consider it to be extremely bland, owning to the fact that it's overly bright. You've basically got white light streaming in from the sky, when it should be somewhat yellow. High contrast isn't generally always a great thing.
As for the sand, well heck, I just don't get it.