just a random idea: you might use some other terrain for screenshots. red doesnt really strand out from red
since i already posted something im gonna dl and look at it too...
EDIT: really awesome. nicely used texture ;D
the only thing that could be improved are the 4 triangles marked with purple on this screenshot. you could make them like they are on the other side (picture #1):
also (not sure if this really would make it better :| actually) it would be more logical (?) if the connections were more like on picture #2. but i think your's is good too:
just some ideas ^^