I got a crash with this error. Aparenttly it happened during an alien attack.

Or just release the Spider!

At late game its always better to go full robots and its only viable if you add tons of roboports, far beyond the quantity needed to complete a conventional grid of roboports. Whould be good to have an alternate smarter way to do it.

https://forums.factorio.com/download/file.php?id=19566
What I really don't understand: Under which conditions is this useful? I mean: When is it useful to exchange items this way instead of bringing the items to the target station directly?

This game is about making your own automated factory ...

This is an interesting idea. I think you mean a way to modify bitters attack rate in response to pollution. A way to adjust the amount of pollution needed to get yourself attacked will be nice for a different playstyle, more focused on weaponry.

Being attacked more frequently have nothing to do ...

I think there are several stages in the game depending wood and this suggestion should explain first, at which stage it tries to fix a problem. :)
(Early game, after power, after circuits, after blue potion, after robots...)

There are also several mods about this topic!!

Looking at the tech tree ...

A machine or robot that hunts for trees on a huge area and slowly harvest wood and clear the area, as a mean of viably collect wood for fuel (or other uses), specially on the early game.
This game is about automation after all. Clearing trees is only viable with hand work or telling the robots to do ...

I think what you really need is some goal, that seems to be already adressed by the 0.15, with the new science. I still agree with you because there is a huge gap between other achievements and the circuit one, witch is much more time consuming than the others, unless you make a game focused on that ...

I really like this design, but i don't like two colored undergrounds on the same line, then i made an alternative using the same space on the blue labs: