It's...too simple, really. You could've used more polygons to make rounder platforms. Right now, most platforms are only one polygon each, which makes things look blocky. Spend more time onto your polygon construction.
Also, shade. There is not much shading; I only see black colorings and that's it. Shading makes your polygons look more realistic and less plain.
Background is pretty bland, imo. White turning into a shade of gray at the bottom; not really a good bg. You could go for a peach color at the top and a darker shade of gray at the bottom.
The scenery does not really fit the texture. I mean, grass growing on stone, what the heck?!
Now, if you colored the texture green, I suppose it'll be alright.
Don't make your borders
too thin; make 'em thick enough to ensure full prevention from going outside of the map.
I don't know if it was by intention, but there is only one grenade object in the whole map. You should scatter some nade objects around, like you did with your medikits.
As far as I can see, your layout is pretty neat. Add more and better visuals to go along with the layout in order to produce a fine map.
Sorry if I'm being too much for you.
