I don't like the trees you added; it's supposed to have an abstract feel to it, and the vegetation ruins the effect. Some blackened grass could be appropriate, but otherwise greenery should probably be held back for a map like this.
Some of the lighting seems kind of weird. The red & blue marks are a bit too saturated in color (adjust them so they're a bit grayer), and it would be pretty neat to see the paper-like texture stretched around, not made totally flat; warping it to fit with the direction of the light could be a pretty neat effect.
And... HTF ≠ symmetry! Or, if you're going to make it symmetrical, at least, give it plenty of circular motion, like htf_Arch or htf_Nuclear (although I feel that even maps like
those could have more path divisions, too). Dead-ends + HTF = baaaaaad.
I dunno... I feel like the paper-based atmosphere is kind of a lame excuse to avoid picking interesting background colors and much scenery (aside from those fat ladders I like the stuff in the bases tho'), but then again it's not at all a common concept anyways. Hm...
