I like it, but I feel that something is lacking, and I don't know quite what it is. Perhaps it's just too brown, and my visual cortex expects to see something vaguely blue when there's something "cold"?
Here's a slightly modified version which works only a bit better for me, but it's still not there.
Some of the lines have an almost neon-like quality, so perhaps tweaking some color into them might do something for my impression.
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